# Physics 2204 Unit 4 Review Answers June 2013 -Books Pdf

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30 A transverse wave is moving from left to right In which direction will a particle at the crest. of the wave move next,A down C right,B left D up, 31 On the wave below which pair of points is in phase. 32 Which overtone is shown in the closed air column below. 33 Given the index of refraction for three materials nA 1 00 nG 1 50 and nW 1 33. which best compares the speed of light in each material. A vA vW vG C vG vW vA,B vA vW vG D vW vG vA, 34 Which property of light explains why shadows form. A Doppler Effect C Reflection,B Rectilinear Propagation D Refraction. 35 A person standing in a canyon shouts and hears an echo 1 63 s later If the air. temperature is 25 0 C what is the distance to the canyon wall. A 258 m C 517 m,B 283 m D 566 m, 36 Two students are at a concert Student A is standing 2 m from the stage and student B is. standing 6 m from the stage How does the sound intensity experienced by student A compare. to that experienced by student B,A 3 times greater C 9 times greater.
B 4 times greater D 16 times greater, 37 Eight waves strike a shoreline in 48 s What is the period of the waves. A 0 17 s C 56 s,B 6 0 s D 380 s, 38 What is the critical angle for light travelling from ethyl alcohol n 1 36 into air. 39 What is the wavelength of the wave shown,C 8 00 101 m. D 4 00 102 m, 40 An object is traveling at Mach 2 on a day when the outside temperature is 15o C How fast. is the object traveling,A 171 m s C 664 m s,B 341 m s D 682 m s.
30 When a listener approaches a stationary sound source what happens to the perceived. A decreases C subsonic,B increases D unchanged, 31 What is the expected angle of refraction as a beam of light travels from glass. at an angle of from the normal into water, 32 A student is 3 0 m from a mirror What distance from the student does the virtual image. appear to be,A 1 5 m C 6 0 m,B 3 0 m D 9 0 m, 33 What type of mechanical wave has particle motion in the same direction as energy. A infrared C transverse,B longitudinal D ultrasonic. 34 A buoy bobs up and down on the ocean a total of 12 times in 6 0 seconds What is the. frequency of the motion,A 0 50 Hz C 12 Hz,B 2 0 Hz D 72 Hz.
35 What is the speed of an airplane travelling at Mach 2 if the speed of sound is 332 m s. A 166 m s C 334 m s,B 332 m s D 664 m s, 36 A radio station sends out electromagnetic waves of length 3 11 m At what frequency is. the radio station operating,A 92 6 MHz C 104 MHz,B 96 5 MHz D 108 MHz. 37 A block of glass with an index of refraction of 1 42 is placed in front of a light source What. is the speed of light in the block, 38 A hiker is standing at one end of a canyon that is 175 m wide on a day when the speed of. sound is 341 m s How long does it take the hiker to hear his echo. A 0 513 s C 1 03 s,B 0 974 s D 1 95 s, 39 When a guitar string of unknown frequency is sounded with a 512 Hz tuning fork 15 beats. are heard in 5 0 s Which is a possible frequency of the guitar string. A 497 Hz C 515 Hz,B 512 Hz D 527 Hz, 40 A distant star is known to produce a frequency of Hz If it is moving away from.
the Earth at m s what wavelength is observed on Earth. 44 a A person is standing near a steep cliff and yells out loudly He hears his echo after 15 0. s The temperature outside is 220 C How far away is the cliff 4. 44 b A 145 Hz tuning fork is held over the open end of an adjustable air column that is. closed at the other end The speed of sound in the air column is 345 m s. i Sketch the first two resonant patterns produced inside the air column 2. ii Calculate the length of the air column which produces the second resonant sound. 44 c Medium 2 in both diagrams is the same substance What is the critical angle 2 for light. passing from medium 2 into medium 3 3, 44 a A car is moving towards a stationary observer at 15 1 m s when the driver blows the. horn with a frequency of 870 Hz If the speed of sound is 344 m s what is the frequency of the. sound perceived by the observer 3, 44 b When a tuning fork is held over an adjustable tube open at both ends the distance. between the 1st and 2nd resonant lengths is measured to be 0 12 m. i Draw the standing wave pattern for the 1st and 2nd resonant length 2. ii What is the wavelength of the sound causing the resonance 2. iii What is the frequency of the tuning fork if the speed of sound is 344 m s 1. 44 c Using the concept of diffraction explain why it is possible to hear someone who is. standing just around the corner of a building but it is not possible to see them 3. 44 a A bass guitar string is 1 3 m long and is vibrating in the third harmonic. i Sketch the standing wave pattern produced 1, ii Calculate the frequency if the speed of the wave is 181 m s 2. 44 b A 310 Hz tuning fork is held over the mouth of an air column open at one end If the. speed of sound is 352 m s calculate the length of the air column which produces the second. resonant sound 3, 44 c An ambulance siren emits a frequency of 440 Hz If the air temperature is. calculate the frequency heard by an observer if the ambulance is coming toward him at. 44 d A light with a wavelength of m is shone through two slits which are. m apart Calculate the angle at which the first order maxima occur 3. 44 e A student is standing at the edge of a pool that is 2 3 m deep A set of keys is at the. bottom of the pool 3 2 m from the wall The index of refraction for air is 1 0 and for water is. 1 3 What is the angle of refraction in air 3, 44 a An air mattress floating on a lake bobs up and down 45 times in 5 0 minutes Calculate.
the speed of the water waves produced if the distance between their crests is 4 0 m 3. 44 b A single slit of width 1 0 10 5 m is illuminated by light of wavelength 6 21 10 7 m. Calculate the angle at which the second order minimum occurs 2. 44 c A police car has a speed trap set up on the highway The radar gun emits a. frequency of 9 0 109 Hz and detects waves differing by 1 4 103 Hz. Calculate whether the driver of this car will get a speeding ticket if the speed. limit is 1 0 102 km h 3,44 d The index of refraction for diamond is 2 42. i If light travels from air into diamond calculate the speed of light in diamond 2. ii Calculate the critical angle for diamond in air 2. 44 e A standing wave pattern containing three antinodes is produced on a 6 0 m rope. i Sketch the standing wave pattern produced 1, ii Calculate the speed of the wave if the frequency of its source is 5 5 Hz 3.

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