Question 1

A sound source of 150 watts radiates sound uniformly in all directions.The intensity of the sound at a distance of 4.00 m is

Accepted Answer

A)  0.389 W/m2. 
B)  0.403 W/m2. 
C)  0.582 W/m2. 
D)  0.746 W/m2. 
E)  0.927 W/m2. 
A)  0.389 W/m2. 
B)  0.403 W/m2. 
C)  0.582 W/m2. 
D)  0.746 W/m2. 
E)  0.927 W/m2.

Question 2

The frequency of a periodic wave is 340 Hz.The period of the vibration motion of the wave is

Accepted Answer

A)  2.56 milliseconds. 
B)  2.94 milliseconds. 
C)  3.55 milliseconds. 
D)  3.94 milliseconds. 
E)  4.25 milliseconds. 
A)  2.56 milliseconds. 
B)  2.94 milliseconds. 
C)  3.55 milliseconds. 
D)  3.94 milliseconds. 
E)  4.25 milliseconds.

Question 3

A transverse periodic wave is represented by the equation y(x,t) = -1.50 cm sin(1,500 rad/s t - 10.0 m-1 x).Another transverse wave is represented by the equation y(x,t) = +1.50 cm sin(1,500 rad/s t + 10.0 m-1 x).What is the equation that represents the superposition of the two waves?

Accepted Answer

A)  y(x,t)= 3.0 cm sin(1,500 rad/s t - 10.0 m-1 x) 
B)  y(x,t)= 3.0 cm sin(1,500 rad/s t)cos(10.0 m-1 x) 
C)  y(x,t)= +3.0 cm cos(1,500 rad/s t)sin(10.0 m-1 x) 
D)  y(x,t)= 3.0 cm sin(1,500 rad/s t + 10.0 m-1 x) 
A)  y(x,t)= 3.0 cm sin(1,500 rad/s t - 10.0 m-1 x) 
B)  y(x,t)= 3.0 cm sin(1,500 rad/s t)cos(10.0 m-1 x) 
C)  y(x,t)= +3.0 cm cos(1,500 rad/s t)sin(10.0 m-1 x) 
D)  y(x,t)= 3.0 cm sin(1,500 rad/s t + 10.0 m-1 x)

Question 4

A transverse periodic wave is represented by the equation z(y,t) = 1.50 cm sin(1,250 rad/s t + 10.0 m-1 y).What is the frequency of the vibration of the wave?

Accepted Answer

A)  319 Hz 
B)  289 Hz 
C)  240 Hz 
D)  199 Hz 
E)  150 Hz 
A)  319 Hz 
B)  289 Hz 
C)  240 Hz 
D)  199 Hz 
E)  150 Hz

Question 5

A longitudinal wave is represented by the equation z(z,t) = -2.0 cm sin(1,200 rad/s t - 20 m-1 z).Another longitudinal wave is represented by the equation z(z,t) = +2.0 cm sin(1,200 rad/s t + 20 m-1 z).What is the equation that represents the superposition of the two waves?

Accepted Answer

A)  z(z,t)= +4.0 cm cos(1,200 rad/s t)cos(20 m-1 z). 
B)  z(z,t)= +4.0 cm cos(1,200 rad/s t)sin(20 m-1 z) 
C)  z(z,t)= +4.0 cm cos(1,200 rad/s t)cos(20 m-1 z) 
D)  z(z,t)= -2.0 cm cos(1,200 rad/s t)sin(20 m-1 z) 
A)  z(z,t)= +4.0 cm cos(1,200 rad/s t)cos(20 m-1 z). 
B)  z(z,t)= +4.0 cm cos(1,200 rad/s t)sin(20 m-1 z) 
C)  z(z,t)= +4.0 cm cos(1,200 rad/s t)cos(20 m-1 z) 
D)  z(z,t)= -2.0 cm cos(1,200 rad/s t)sin(20 m-1 z)

Question 6

What is the distance between nodes?

Accepted Answer

A)  wavelength/4 
B)  wavelength/3 
C)  wavelength/2 
D)  wavelength/1 
A)  wavelength/4 
B)  wavelength/3 
C)  wavelength/2 
D)  wavelength/1

Question 7

Of these properties of waves,which one is independent of the others?

Accepted Answer

A)  amplitude 
B)  speed 
C)  frequency 
D)  wavelength 
A)  amplitude 
B)  speed 
C)  frequency 
D)  wavelength

Question 8

The speed of sound in air is dependent upon the air temperature and other factors.The speed of sound increases from 334 m/s to 341 m/s between 8:00am and 11:00am.If a horn produces sound with wavelength 0.75 m at 8:00am,what would it produce at 11:00am?

Accepted Answer

A)  73 cm 
B)  77 cm 
C)  Not enough info given to solve. 
D)  75 cm 
A)  73 cm 
B)  77 cm 
C)  Not enough info given to solve. 
D)  75 cm

Question 9

Two speakers are driven exactly out of phase with each other at 256 Hz.If a microphone is placed on the line between the two speakers exactly in the middle of the line,what is possibly the distance between the microphone and each speaker? The speed of sound is 340 m/s.

Accepted Answer

A)  0.75 m 
B)  0.38 m 
C)  Can be any distance at all 
D)  1.50 m 
E)  0.94 m 
A)  0.75 m 
B)  0.38 m 
C)  Can be any distance at all 
D)  1.50 m 
E)  0.94 m

Question 10

A string with a mass/length of 0.00200 kg/m is stretched between two points with a tension of 120 N.If the fundamental frequency is 660 Hz,then what is the distance between the two points?

Accepted Answer

A)  17.5 cm 
B)  18.6 cm 
C)  20.3 cm 
D)  26.7 cm 
E)  30.0 cm 
A)  17.5 cm 
B)  18.6 cm 
C)  20.3 cm 
D)  26.7 cm 
E)  30.0 cm

Question 11

A microphone records sound produced from two speakers in a room with no other sound sources.If the intensity of one of the sound waves at a given location is 0.055 W/m2 and if the microphone receives a minimum intensity of 0.004 W/m2 when both speakers are active what is a possible value for the intensity of the other source at the microphone's location?

Accepted Answer

A)  Need more info to solve. 
B)  0.088 W/m2 
C)  0.051 W/m2 
D)  0.048 W/m2 
A)  Need more info to solve. 
B)  0.088 W/m2 
C)  0.051 W/m2 
D)  0.048 W/m2

Question 12

A pair of sound wave sources interfere destructively at a point that is 3/4 of the way from one speaker to the other.If the speed of sound is 343 m/s,and the sound waves are emitted at 880 Hz,which of the following is a possible distance between the two speakers?

Accepted Answer

A)  2.7 m 
B)  0.58 m 
C)  1.16 m 
D)  1.9 m 
E)  77 cm 
A)  2.7 m 
B)  0.58 m 
C)  1.16 m 
D)  1.9 m 
E)  77 cm

Question 13

Two strings on a violin are stretched between two points 20 cm apart.The tensions of the strings are the same.If the ratio of the frequencies of the fundamental modes is 1.5 to 1.0,then what is the ratio of the mass per lengths in the strings?

Accepted Answer

A)  0.80 
B)  0.90 
C)  0.85 
D)  0.94 
E)  0.78 
A)  0.80 
B)  0.90 
C)  0.85 
D)  0.94 
E)  0.78

Question 14

Two speakers emit coherent sound waves into the open air.One of them produces 75 W of power.If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 W/m2,what is the power output of the second speaker?

Accepted Answer

A)  151 W 
B)  377 W 
C)  Need more info to solve. 
D)  38 W 
A)  151 W 
B)  377 W 
C)  Need more info to solve. 
D)  38 W

Question 15

A string on a guitar is stretched between two points 35.0 cm apart with a tension of 65.0 N.The mass/length of the string is 0.00400 kg/m.The wavelength of the mode of vibration with the lowest frequency is

Accepted Answer

A)  0.5 m. 
B)  0.6 m. 
C)  0.7 m. 
D)  0.8 m. 
E)  0.9 m. 
A)  0.5 m. 
B)  0.6 m. 
C)  0.7 m. 
D)  0.8 m. 
E)  0.9 m.

Question 16

A transverse wave travels at 230.0 m/s along the y-axis.If the frequency of the periodic vibrations of the wave is 390.0 Hz,then what is the wavelength of the wave?

Accepted Answer

A)  58.97 cm 
B)  47.23 cm 
C)  40.89 cm 
D)  36.76 cm 
E)  68.97 cm 
A)  58.97 cm 
B)  47.23 cm 
C)  40.89 cm 
D)  36.76 cm 
E)  68.97 cm

Question 17

The following figure is a graph of a wave at a fixed position.   The following figure is a graph of the same wave at a fixed time.   What is the velocity of the wave in the above figure?

Accepted Answer

A)  150 m/s 
B)  200 m/s 
C)  250 m/s 
D)  300 m/s 
E)  450 m/s 
A)  150 m/s 
B)  200 m/s 
C)  250 m/s 
D)  300 m/s 
E)  450 m/s

Question 18

A string on a violin is stretched between two points 20.00 cm apart with a tension of 120.0 N.The mass/length of the string is 0.002000 kg/m.The frequency of the mode next higher than the fundamental mode is

Accepted Answer

A)  1,400 Hz. 
B)  1,322 Hz. 
C)  1,225 Hz. 
D)  1,558 Hz. 
E)  2,120 Hz. 
A)  1,400 Hz. 
B)  1,322 Hz. 
C)  1,225 Hz. 
D)  1,558 Hz. 
E)  2,120 Hz.

Question 19

A transverse periodic wave is represented by the equation y(x,t) = 1.50 cm sin(1,500 rad/s t - 10.0 m-1 x).Another transverse wave is represented by the equation y(x,t) = 1.50 cm sin(1,500 rad/s t + 10.0 m-1 x).What is the equation that represents the superposition of the two waves?

Accepted Answer

A)  y(x,t)= 3.0 cm sin(1,500 rad/s t - 10.0 m-1 x) 
B)  y(x,t)= 3.0 cm sin(1,500 rad/s t)cos(10.0 m-1 x) 
C)  y(x,t)= +3.0 cm cos(1,500 rad/s t)sin(10.0 m-1 x) 
D)  y(x,t)= 3.0 cm sin(1,500 rad/s t + 10.0 m-1 x) 
A)  y(x,t)= 3.0 cm sin(1,500 rad/s t - 10.0 m-1 x) 
B)  y(x,t)= 3.0 cm sin(1,500 rad/s t)cos(10.0 m-1 x) 
C)  y(x,t)= +3.0 cm cos(1,500 rad/s t)sin(10.0 m-1 x) 
D)  y(x,t)= 3.0 cm sin(1,500 rad/s t + 10.0 m-1 x)

Question 20

A transverse wave travels at 250 m/s along the z-axis.If the frequency of the periodic vibrations of the wave is 440 Hz,then what is the wavelength of the wave?

Accepted Answer

A)  21.9 cm 
B)  26.7 cm 
C)  35.7 cm 
D)  56.8 cm 
E)  73.7 cm 
A)  21.9 cm 
B)  26.7 cm 
C)  35.7 cm 
D)  56.8 cm 
E)  73.7 cm

Exam 11: Waves

A sound source of 150 watts radiates sound uniformly in all directions.The intensity of the sound at a distance of 4.00 m is

The frequency of a periodic wave is 340 Hz.The period of the vibration motion of the wave is

A transverse periodic wave is represented by the equation y(x,t) = -1.50 cm sin(1,500 rad/s t - 10.0 m-1 x).Another transverse wave is represented by the equation y(x,t) = +1.50 cm sin(1,500 rad/s t + 10.0 m-1 x).What is the equation that represents the superposition of the two waves?

A transverse periodic wave is represented by the equation z(y,t) = 1.50 cm sin(1,250 rad/s t + 10.0 m-1 y).What is the frequency of the vibration of the wave?

A longitudinal wave is represented by the equation z(z,t) = -2.0 cm sin(1,200 rad/s t - 20 m-1 z).Another longitudinal wave is represented by the equation z(z,t) = +2.0 cm sin(1,200 rad/s t + 20 m-1 z).What is the equation that represents the superposition of the two waves?

What is the distance between nodes?

Of these properties of waves,which one is independent of the others?

The speed of sound in air is dependent upon the air temperature and other factors.The speed of sound increases from 334 m/s to 341 m/s between 8:00am and 11:00am.If a horn produces sound with wavelength 0.75 m at 8:00am,what would it produce at 11:00am?

Two speakers are driven exactly out of phase with each other at 256 Hz.If a microphone is placed on the line between the two speakers exactly in the middle of the line,what is possibly the distance between the microphone and each speaker? The speed of sound is 340 m/s.

A string with a mass/length of 0.00200 kg/m is stretched between two points with a tension of 120 N.If the fundamental frequency is 660 Hz,then what is the distance between the two points?

A pair of sound wave sources interfere destructively at a point that is 3/4 of the way from one speaker to the other.If the speed of sound is 343 m/s,and the sound waves are emitted at 880 Hz,which of the following is a possible distance between the two speakers?

Two strings on a violin are stretched between two points 20 cm apart.The tensions of the strings are the same.If the ratio of the frequencies of the fundamental modes is 1.5 to 1.0,then what is the ratio of the mass per lengths in the strings?

Two speakers emit coherent sound waves into the open air.One of them produces 75 W of power.If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 W/m2,what is the power output of the second speaker?

A string on a guitar is stretched between two points 35.0 cm apart with a tension of 65.0 N.The mass/length of the string is 0.00400 kg/m.The wavelength of the mode of vibration with the lowest frequency is

A transverse wave travels at 230.0 m/s along the y-axis.If the frequency of the periodic vibrations of the wave is 390.0 Hz,then what is the wavelength of the wave?

The following figure is a graph of a wave at a fixed position. The following figure is a graph of the same wave at a fixed time. What is the velocity of the wave in the above figure?

A string on a violin is stretched between two points 20.00 cm apart with a tension of 120.0 N.The mass/length of the string is 0.002000 kg/m.The frequency of the mode next higher than the fundamental mode is

A transverse periodic wave is represented by the equation y(x,t) = 1.50 cm sin(1,500 rad/s t - 10.0 m-1 x).Another transverse wave is represented by the equation y(x,t) = 1.50 cm sin(1,500 rad/s t + 10.0 m-1 x).What is the equation that represents the superposition of the two waves?

A transverse wave travels at 250 m/s along the z-axis.If the frequency of the periodic vibrations of the wave is 440 Hz,then what is the wavelength of the wave?

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

A transverse periodic wave is represented by the equation y(x,t) = -1.50 cm sin(1,500 rad/s t - 10.0 m^-1 x).Another transverse wave is represented by the equation y(x,t) = +1.50 cm sin(1,500 rad/s t + 10.0 m^-1 x).What is the equation that represents the superposition of the two waves?

A transverse periodic wave is represented by the equation z(y,t) = 1.50 cm sin(1,250 rad/s t + 10.0 m^-1 y).What is the frequency of the vibration of the wave?

A longitudinal wave is represented by the equation z(z,t) = -2.0 cm sin(1,200 rad/s t - 20 m^-1 z).Another longitudinal wave is represented by the equation z(z,t) = +2.0 cm sin(1,200 rad/s t + 20 m^-1 z).What is the equation that represents the superposition of the two waves?

Two speakers emit coherent sound waves into the open air.One of them produces 75 W of power.If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 W/m²,what is the power output of the second speaker?

A transverse periodic wave is represented by the equation y(x,t) = 1.50 cm sin(1,500 rad/s t - 10.0 m^-1 x).Another transverse wave is represented by the equation y(x,t) = 1.50 cm sin(1,500 rad/s t + 10.0 m^-1 x).What is the equation that represents the superposition of the two waves?