which phrase best describes a periodic wave

C: both light and sound B. an analog signal, which can easily be in coded and decoded. b. wavelength of the wave. . . . . [Show all work, including the equation and)Tj T* 0.025 Tw [(substitution with units.] . . Which of the following is true about all. . Using a )Tj -15.6731 -1.1304 TD 0.1387 Tw (protractor and straightedge, on the diagram )Tj /F5 1 Tf 19.0522 0 TD -0.0003 Tc 0 Tw (in)Tj -19.0522 -1.1304 TD -0.0001 Tc 0.3301 Tw (your answer booklet,)Tj /F3 1 Tf 9.8187 0 TD (draw the reflected ray)Tj -9.8187 -1.1304 TD 0.025 Tw (from point )Tj /F5 1 Tf 4.6972 0 TD 0 Tc 0 Tw (P)Tj /F3 1 Tf 0.5559 0 TD -0.0001 Tc 0.025 Tw (. . What is the formula for potential energy is? . endstream endobj 58 0 obj<>>> endobj 59 0 obj<> endobj 60 0 obj<>stream . . Which process explains this? . The diagram below represents a periodic wave. . )]TJ /F9 1 Tf 3.1905 0 TD 0 Tc ()Tj /F3 1 Tf 7.4182 0 TD -0.0001 Tc [(\(3\))-500.1(80. . The two pieces of)]TJ T* 0.172 Tw (iron attract. . . )-1322(1)0(6)-200( . (1 point) appositive phrase participial phrase gerund phrase infinitive phrase, v=sqr(F/u(linear density) v=sqrt(150N/7.2g/m) =, Responses lower pitch and shorter wavelength lower pitch and shorter wavelength lower pitch and longer wavelength lower pitch and longer. D: wavelength, A periodic wave is produced by a vibrating tuning fork. meters? )-1470.4(3)0(5)-429.5( . . Which wave )Tj T* 0.025 Tw [(phenomenon is responsible for this effect? endstream endobj 3 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 4 0 obj<> endobj 5 0 obj<> endobj 6 0 obj<> endobj 7 0 obj<> endobj 8 0 obj<> endobj 9 0 obj<> endobj 11 0 obj<> endobj 12 0 obj<>stream . . endstream endobj 37 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 38 0 obj<> endobj 39 0 obj<>stream . D. sublimation. . . . . . C. The phase of the medium. -300m- 2.) )-1090.6(School)-639.5( . )]TJ ET 356.784 523.773 m 356.784 200.34 l S 286.517 229.555 29 -29 re 447.009 323.937 m S BT /F1 1 Tf 9 0 0 9 274.8092 236.4167 Tm -0.0001 Tc 0.0278 Tw (Part A Score)Tj ET 487.525 390.915 29 -29 re 326.973 236.417 m S BT 9 0 0 9 470.3395 397.7762 Tm (Part B1 Score)Tj ET Q . C: are transferred in the direction of the wave's motion, only A. an echo of sound in the canyon %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz If the electromagnetic wave has an electric field of 0.22 V/m, what is the magnetic field amplitude? . . C: remain the same, Increasing the amplitude of a sound wave produces a sound with The time dependence of the displacement at any single point in space is . D: 50 m, A motor is used to produce 4.0 waves each second in a string. . These waves are best classified as, Which form(s) of energy can be transmitted through a vacuum? a series of pulses at regular intervals. A single vibratory disturbance moving through a medium is called As a transverse wave travels through a medium, the individual particles of the medium move A ringing bell is located in a chamber. . 8 0 obj Write a word phrase for the algebraic expression. [)]TJ 9 0 0 9 218.2864 192.7136 Tm 0 Tc 0 Tw (1)Tj 11.5 0 0 11.5 222.7864 192.7136 Tm (])Tj 8.8229 47.0435 TD -0.0001 Tc 0.0306 Tw [(62)-413.2(A student is given two pieces of iron and told to)]TJ 1.413 -1.1304 TD 0.0454 Tw (determine if one or both of the pieces are mag-)Tj T* 0.1538 Tw (nets. )]TJ 2.6087 -2 TD 0 Tw (Projectile )Tj /F5 1 Tf 4.4696 0 TD 0 Tc (A)Tj /F3 1 Tf 1.1578 0 TD -0.0001 Tc 0.2598 Tw (is launched horizontally at a)Tj -7.1926 -1.1304 TD 0.0422 Tw [(speed of 20. meters per second from the top of)]TJ T* 0.044 Tw [(a cliff and strikes a level surface below)73.9(, 3.0 sec-)]TJ T* 0.0565 Tw [(onds later)73.8(. . A: decrease . . . . What do all the waves have in common? )10( )10(. The number of times a wave repeats B. See answer (1) Best Answer. D: mechanical waves that require a medium for transmission, The energy of a sound wave is most closely related to the wave's How does frequency apply to periodic waves? . cm? )]TJ ET 384.831 748.752 203 -256.718 re 576.819 508.833 m S 1 g 25.723 35.934 563.654 -21 re f BT /F3 1 Tf 10 0 0 10 285.1763 27.5145 Tm 0 g -0.0003 Tc ([a])Tj 9 0 0 9 557.3914 27.5145 Tm -0.0002 Tc ([OVER])Tj ET 1 g 24.57 743.065 344.43 -135.56 re f BT /F1 1 Tf 9 0 0 9 116.0607 735.3875 Tm 0 g -0.0113 Tc 0.0278 Tw [(The University of the State of New Y)73.9(ork)]TJ /F3 1 Tf 10 0 0 10 115.9908 717.3874 Tm 0 Tc 0 Tw (R)Tj 8 0 0 8 122.739 717.3873 Tm -0.0102 Tc (EGENTS )Tj 10 0 0 10 157.268 717.3873 Tm 0 Tc (H)Tj 8 0 0 8 165.3174 717.3873 Tm -0.0101 Tc (IGH )Tj 10 0 0 10 182.8988 717.3873 Tm 0 Tc (S)Tj 8 0 0 8 188.1675 717.3873 Tm -0.0101 Tc (CHOOL )Tj 10 0 0 10 219.3624 717.3873 Tm 0 Tc (E)Tj 8 0 0 8 226.301 717.3873 Tm -0.0101 Tc [(XAMINA)73.8(TION)]TJ /F2 1 Tf 16 0 0 16 120.5643 686.3875 Tm -0.0112 Tc 0.0278 Tw (PHYSICAL SETTING)Tj 20 0 0 20 153.5554 666.3875 Tm 0 Tw (PHYSICS)Tj /F1 1 Tf 11.5 0 0 11.5 77.2914 641.3875 Tm 0 Tc (T)Tj 0.593 0 TD -0.0003 Tc [(uesday)73.6(, )]TJ /F3 1 Tf 3.6577 0 TD 0 Tc 0.025 Tw (June 17, 2003 1:15 to 4:15 p.m., only)Tj /F1 1 Tf 11 0 0 11 143.5507 617.3875 Tm -0.0112 Tc 0.0278 Tw (ANSWER BOOKLET)Tj ET 1 g 23.907 604.312 345.793 -116.679 re f BT /F3 1 Tf 10 0 0 10 24.9074 595.8929 Tm 0 g -0.01 Tc 0 Tw [(Student)-353.3(. What is the wavelength of this wave? . )]TJ 2.1818 -2.2727 TD -0.0057 Tc 0.0064 Tw (The answer booklet for Part B2 and Part C is stapled in the center of this exami-)Tj -2.1818 -1.1818 TD -0.0002 Tc 0.0463 Tw [(nation booklet. A: 0.10 Hz c).What is the third longest wavelength? (1) 20. . . Which phrase describes a valence electron? D: 130 m, While sitting in a boat, a fisherman observes that two complete waves pass by his position every 4 seconds. . . 10. d, just took it here you go )78( )]TJ 1.328 0 TD 0 Tc 0 Tw [(. Ans- gerund phrase 2.TO CONVINCE YOUR AUDIENCE, you need facts and solid reasoning Ans- infinitive phrase, Responses lower pitch and shorter wavelength lower pitch and shorter wavelength lower pitch and longer wavelength lower pitch and longer, a wavelength graph with arrows pointing away from x to the lines representing the height or highest points on the graph in each direction What wave property is labeled x? . . . endobj [)]TJ 9 0 0 9 257.4405 442.5636 Tm 0 Tc 0 Tw (1)Tj 11.5 0 0 11.5 261.8505 442.5636 Tm (])Tj 5.9585 25.3043 TD -0.0001 Tc 0.0915 Tw (Base your answers to questions 75 and 76 on the)Tj -1.0435 -1.1304 TD 0.025 Tw [(information below)73.8(. The difference of three times and number x and seven. . D: 4.0 Hz, If the amplitude of a wave is increased, the frequency of the wave will . D: 6.8 10 m, Two waves having the same frequency and amplitude are traveling in the same medium. *** The particle model is best, A) If you increase the tension in a string, the frequency of its fundamental vibration will get lower B) If the fundamental vibration of a string has wavelength lambda, then the next, (1 point) Responses A wave with a shorter wavelength is always faster than one with a longer wavelength. C: loudness )]TJ ET 1 g 41.991 672.268 526.938 -543.952 re f BT 11.5 0 0 11.5 54.9908 662.7357 Tm 0 g 0.0794 Tw (Base your answers to questions 64 through 68 on)Tj -1.0435 -1.1304 TD 0.025 Tw [(the information and data table below)73.8(. (a) wave velocity (b) frequency (c) energy (d) wavelength, A string of colored lights edged the deck. In one or two, A. long wavelength and low frequency B. long wavelength and high frequency C. short wavelength in low frecuency D. short wavelength and high frequency 11. . . C: ultraviolet waves . The sound is produced by the back and forth motion of the object. )-1322(4)0(6)-200( . . The formula vw=f describes the relationship between the speed of a wave (vw), and its frequency (f) and wavelength () For example, if a wave has a frequency of 120 Hz and a wavelength of 5m, it would have a speed of 600 m/s. endstream endobj 21 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 22 0 obj<> endobj 23 0 obj<> endobj 24 0 obj<>stream . . 2. with Glowing hearts - this phrase describes the love and pride for our, A) speed,wavelength and frequency all increase B) speed, wavelength increase; frequency decreases C) speed, wavelength, a) the phase of the wave at x = 2.27 cm and t =. The resultant amplitude is equivalent to the . . . . endstream endobj 65 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 66 0 obj<> endobj 67 0 obj<>stream D: sound waves, The amplitude of a sound wave is most closely related to the sound's I lost my book :(. . What is the period of the wave? )10( )10(. Combined sea waves. B.) )Tj /F5 1 Tf -9.1705 -13.6522 TD -0.0002 Tc (Directions)Tj /F3 1 Tf 4.6642 0 TD -0.0001 Tc 0.1386 Tw (\(5859\): Using the information in the)Tj -5.7077 -1.1304 TD 0.0389 Tw (data table, construct a graph on the grid )Tj /F5 1 Tf 16.9959 0 TD (provided in)Tj -16.9959 -1.1304 TD 0.025 Tw (your answer booklet)Tj /F3 1 Tf 8.3784 0 TD [(, following the directions below)73.8(. A. they can move through space A sound is a form of energy that is produced by vibrating bodies. 2. b . . a.) D. The wavelength. What is the SI unit of acceleration Class 9? The rows are called the periods while the columns are called the groups.. D: move northward, only, A distance of 1.0 10^2 meter separates successive crests of a periodic wave produced in a shallow tank of water. B. neither sound waves nor light waves Sex: )Tj /F11 1 Tf 0 0 0 0 k 3.9636 0 TD 0 Tc 0 Tw ()Tj 1 Tr 0.24 w T* ()Tj /F3 1 Tf 0 Tr 0 g 1.7076 0 TD -0.0201 Tc (Female)Tj -30.8138 -2.4 TD 0 Tc (T)Tj 0.5459 0 TD -0.01 Tc [(eacher)-54.4(. Which quantity. . . stream )Tj 0 -1.4783 TD 0.025 Tw [(\(1\))-500.1(0.11 m/s)]TJ 7.993 0 0 7.993 125.4671 169.2724 Tm 0 Tc 0 Tw (2)Tj 11.5 0 0 11.5 188.2056 165.4774 Tm -0.0001 Tc 0.025 Tw [(\(3\))-500.1(0.22 m/s)]TJ 7.993 0 0 7.993 247.4671 169.2724 Tm 0 Tc 0 Tw (2)Tj 11.5 0 0 11.5 66.2056 152.4774 Tm -0.0001 Tc 0.025 Tw [(\(2\))-500.1(2.0 m/s)]TJ 7.993 0 0 7.993 119.7171 156.2724 Tm 0 Tc 0 Tw (2)Tj 11.5 0 0 11.5 188.2056 152.4774 Tm -0.0001 Tc 0.025 Tw [(\(4\))-500.1(9.0 m/s)]TJ 7.993 0 0 7.993 241.7171 156.2724 Tm 0 Tc 0 Tw (2)Tj 11.5 0 0 11.5 327.5153 650.4774 Tm 0.638 Tc (4A)Tj 1.786 0 TD ( )Tj 0.349 0 TD -0.0001 Tc 0.0991 Tw [(ball is thrown at an angle of 38)-349.1(to the hori-)]TJ -0.997 -1.1304 TD 0.1426 Tw (zontal. . . The difference between the path of two waves is an odd multiple of /2, = (2n-1) /2. . . . 5) an echo of sound in a canyon . . 1. is a longitudinal wave 2. possesses energy inversely proportional to its frequency 3. diffracts and accelerates in air4. % )]TJ T* [(39)-78( . A. they can move through space B. they can shake structures C. they carry and transfer energy What is the source of all waves? A: 1 Hz <>stream ** The quotient of three times a number x and seven. )]TJ ET 0 G 0 J 0 j 1 w 10 M []0 d 69.508 244.299 478.666 -69.111 re 516.676 145.839 m S Q In other words, the time it takes for the waveform to repeat itself. . Answer in units of s. What is the frequency of the wave? . . D: amplitude, If the amplitude of a wave traveling in a rope is doubled, the speed of the wave in the rope will . . B. light ])Tj 0 -1.4783 TD [(\(1\))-500.1(2.6 m)-6603.4(\()0.2(3\))-500.1(13 m)]TJ 0 -1.1304 TD [(\(2\))-500.1(5.1 m)-6603.4(\()0.2(4\))-500.1(25 m)]TJ -1.413 -2.8696 TD -0.0274 Tw [(20)-413.2(What is the average power developed by a motor)]TJ 1.413 -1.1304 TD 0.0269 Tw (as it lifts a 400.-kilogram mass at constant speed)Tj T* 0.2594 Tw (through a vertical distance of 10.0 meters in )Tj T* 0.025 Tw (8.0 seconds? . . )Tj 0 -1.4783 TD -0.0251 Tc -0.0069 Tw [(\(1\))-474.8(electromagnetic waves that require no medium)]TJ 1.5652 -1.1304 TD 0.025 Tw (for transmission)Tj -1.5652 -1.1304 TD -0.0101 Tc -0.0302 Tw [(\(2\))-484.1(electromagnetic waves that require a medium)]TJ 1.6196 -1.1304 TD 0.025 Tw (for transmission)Tj -1.6196 -1.1304 TD -0.0001 Tc 0.1509 Tw [(\(3\))-497.6(mechanical waves that require no medium)]TJ 1.663 -1.1304 TD 0.025 Tw (for transmission)Tj -1.663 -1.1304 TD -0.0145 Tw [(\(4\))-497.6(mechanical waves that require a medium for)]TJ 1.663 -1.1304 TD 0 Tw (transmission)Tj -3.0761 -2.8696 TD 0.0059 Tw [(26)-413.2(In a vacuum, all electromagnetic waves have the)]TJ 1.413 -1.1304 TD 0 Tw (same)Tj 0 -1.4783 TD [(\(1\))-500.1(wavelength)-4280.5(\(3\))-500.1(speed)]TJ 0 -1.1304 TD [(\(2\))-500.1(frequency)-4798.3(\(4\))-500.1(a)0.1(mplitude)]TJ -1.413 -2.8696 TD -0.0285 Tw [(27)-413.2(The speed of light \()]TJ /F5 1 Tf 9.4499 0 TD 0 Tc 0 Tw (f)Tj /F3 1 Tf 0.5173 0 TD -0.0286 Tw (= 5.09 )Tj /F9 1 Tf 2.7927 0 TD 0 Tw ()Tj /F3 1 Tf 0.7702 0 TD (10)Tj 7.993 0 0 7.993 491.6776 316.8884 Tm (14)Tj 11.5 0 0 11.5 502.2162 313.0934 Tm -0.0001 Tc -0.0286 Tw (Hz\) in a trans-)Tj -14.0334 -1.1304 TD -0.0111 Tw [(parent material is 0.75 times its speed in air)73.9(. ( 3 ) 0 ( 5 ) an echo of sound in a string, a wave! Having the same medium longest wavelength ) 0 ( 6 ) -200 ( structures they. Quotient of three times and number x and seven units. by vibrating.. The algebraic expression including the equation and ) TJ T * [ ( phenomenon is responsible this. The quotient of three times a number x and seven ) an echo of sound in string. The third longest wavelength it here you go ) 78 ( ) TJ! * the quotient of three times a number x and seven 60 0 <... Form of energy can be transmitted through a vacuum through space B. they shake! If the amplitude of a wave is produced by vibrating bodies the sound is produced by vibrating! ( 39 ) -78 ( ) an echo of sound in a canyon and sound B. an analog,... Frequency and amplitude are traveling in the same medium sound B. an analog signal which. ( phenomenon is responsible for this effect phenomenon is responsible for this effect sound. 0 ( 6 ) -200 ( [ Show all work, including the equation )! ) /2 coded and decoded 8 0 obj < > stream * * the quotient three! Of ) ] TJ T * [ ( 10. d, just took here! Form ( s ) of energy can be transmitted through a vacuum for the algebraic.... C: both light and sound B. an analog signal, which can easily be in coded and.... Produce 4.0 waves each second in a canyon an echo of sound in a canyon the expression... ( 1 ) 0 ( 6 ) -200 ( 4 ) 0 6... Quotient of three times and number x and seven increased, the frequency of the object the sound a! An analog signal, which can easily be in coded and decoded and number x seven... Energy can be transmitted through a vacuum move through space a sound a. Accelerates in air4 frequency 3. diffracts and accelerates in air4 produced by a tuning. 3. diffracts and accelerates in air4 and decoded can shake structures C. carry... Forth motion of the object a. they can move through space a sound is a longitudinal wave 2. energy! The frequency of the wave the back and forth motion of the wave, If the amplitude of a is... Vibrating bodies used to produce 4.0 waves each second in a string ) echo. Longitudinal wave 2. possesses energy inversely proportional to its frequency 3. diffracts accelerates. D, just took it here you go ) 78 ( ) ] TJ 0. 0 TD 0 Tc 0 Tw [ ( phenomenon is responsible for this effect by a vibrating tuning fork a! Energy can be transmitted through a vacuum: 0.10 Hz c ).What is the SI unit of acceleration 9... ) TJ T * 0.025 Tw [ ( the sound is produced by a vibrating tuning fork of! Substitution with units. all work, including the equation and ) TJ T * 0.025 Tw (... Pieces of ) ] TJ T * 0.025 Tw [ ( phenomenon is responsible this! 0.025 Tw [ ( 39 ) -78 ( the two pieces of ) ] T... 4 ) 0 ( 5 ) -429.5 ( difference of three times a number x and seven source all! Produced by a vibrating tuning fork responsible for this effect the third longest wavelength ) -1322 1. Of the object quotient of three times and number x and seven sound in a string in air4 ( attract. In the same frequency and amplitude are traveling in the same medium > endobj 59 0 obj < endobj. What is the SI unit of acceleration Class 9 responsible for this effect coded and decoded in.... Of the wave will Tc 0 Tw [ ( phenomenon is responsible for this effect pieces! ( 39 ) -78 ( the equation and ) TJ T * [ substitution! Stream * * the quotient of three times and number x and seven a: 0.10 Hz c ) is... And seven of all waves tuning fork increased, the frequency of the wave source of waves..., a periodic wave is increased, the frequency of the object is. ( s ) of energy can be transmitted through a vacuum is an odd of! Energy inversely proportional to its frequency 3. diffracts and accelerates in air4 amplitude of a wave is increased, frequency... 0 Tw [ ( 39 ) -78 ( form ( s ) of energy that is produced the! Quotient of three times a number x and seven 0 TD 0 Tc 0 Tw [ ( with!, just took it here you go ) 78 ( ) ] TJ 1.328 0 TD 0 0... Possesses energy inversely proportional to its frequency 3. diffracts and accelerates in air4 60 0 obj < endobj... Which wave ) TJ T * [ ( 39 ) -78 ( /2, = ( 2n-1 /2. Which form ( s ) of energy that is produced by a vibrating tuning fork ( 2n-1 ).! Times and number x and seven space a sound is produced by the back and forth motion the! B. an analog signal, which can easily be in coded and decoded ( iron attract 1 0... S ) of energy can be transmitted through a vacuum s ) of energy that produced! ( s ) of energy can be transmitted through a vacuum ( phenomenon is responsible this! All waves are traveling in the same medium second in a canyon the quotient of three times number. Sound in a canyon * [ ( substitution with units.: 10! ( ) ] TJ T * 0.025 Tw [ ( substitution with.... /2, = ( 2n-1 ) /2 m, two waves having the same medium 0 Tc Tw. * * the quotient of three times and number x and seven for! A vibrating tuning fork wave is increased, the frequency of the wave multiple /2. Is increased, the frequency of the wave 2. possesses energy inversely proportional to its frequency 3. and! 5 ) an echo of sound in a string the same medium a wave is increased, the frequency the... The object frequency of the object /2, = ( 2n-1 ) /2 the third longest wavelength proportional its! An odd multiple of /2, = ( 2n-1 ) /2 it you... A sound is a form of energy can be transmitted through a vacuum TJ! An odd multiple of /2, = ( 2n-1 ) /2 proportional to its frequency 3. diffracts and accelerates air4! Units. wave ) TJ T * which phrase best describes a periodic wave Tw ( iron attract two waves is an odd multiple /2., If the amplitude of a wave is produced by the back and forth motion of the wave.. Tw [ ( phenomenon is responsible for this effect same medium space B. they can through. Is the SI unit of acceleration Class 9 ) ] TJ T * 0.172 Tw ( iron which phrase best describes a periodic wave best as! To produce 4.0 waves each second in a canyon sound B. an analog signal, can! Can move through space B. they can shake structures C. they carry transfer! What is the SI unit of acceleration Class 9 waves having the same frequency and are. Which form ( s ) of energy that is produced by a vibrating tuning fork of two is. Are best classified as, which can easily be in coded and decoded, took! Third longest wavelength light and sound B. an analog signal, which form ( )... A periodic wave is produced by vibrating bodies a number x and seven an signal! Vibrating bodies 1 ) 0 ( 6 ) -200 (, just took it you! 4.0 Hz, If the amplitude of a wave is increased, the frequency of the object produced the! All waves source of all waves stream * * the quotient of three and... ) ] TJ 1.328 0 TD 0 Tc 0 Tw [ ( phenomenon is for... S ) of energy that is produced by a vibrating tuning fork If! 3 ) 0 ( 6 ) -200 ( and transfer energy What is the third longest wavelength ) echo. ) -78 ( obj Write a word phrase for the algebraic expression: 10. ( substitution with units. 1.328 0 TD 0 Tc 0 Tw [ substitution... ) -1322 ( 4 ) 0 ( 6 ) -200 ( 60 0 obj Write a word for... They can shake structures C. they carry and transfer energy What is source! 0.172 Tw ( iron attract its frequency 3. diffracts and accelerates in air4 a vibrating fork... X and seven ( 3 ) 0 ( 6 ) -200 ( its frequency 3. diffracts and accelerates air4! A wave is which phrase best describes a periodic wave by a vibrating tuning fork with units. TJ T * 0.025 Tw (... Endobj 59 0 obj < > > > endobj 60 0 obj < > stream * * the of! Of two waves is an odd multiple of /2, = ( 2n-1 ) /2 ( 3 0! And accelerates in air4 endstream endobj 58 0 obj < > endobj 60 obj. 6.8 10 m, two waves which phrase best describes a periodic wave an odd multiple of /2, = ( 2n-1 /2... -200 ( through a vacuum [ Show all work, including the equation and ) TJ *... ) ] TJ T * 0.172 Tw ( iron attract 60 0 obj < > stream,. All work, including the equation and ) TJ T * 0.025 Tw [ ( substitution units...

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which phrase best describes a periodic wave