Question 1

Write the equation of a wave, travelling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec.

Accepted Answer

A)  y = 0.02 sin [880  π\piπ (x/330 -t) ]
B)  y = 0.02 cos [880  π\piπ  x/330 -440t]
C)  y = 0.02 sin [880  π\piπ (x/330 + t) ]
D)  y = 0.02 sin [2  π\piπ (x/330 + 440t) ]
E)  y = 0.02 cos [2  π\piπ 0(x/330 + 440t) ] F) A) and D)
G) A) and B)

Question 2

If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they travelling?

Accepted Answer

The answer of If the breakers at a beach are...

Question 3

The velocity of sound in sea water is 1.53 * 103 m/s. Find the bulk modulus (in N/m2)  of sea water if its density is 1.03 *103 kg/m3.

Accepted Answer

A)  2.57 * 109
B)  2.19 * 109
C)  2.04 * 109
D)  2.41 * 109
E)  2.82 * 109F) None of the above
G) B) and E)

Question 4

A point source emits sound with a power output of 100 watts. What is the intensity (in W/m2)  at a distance of 10.0 m from the source?

Accepted Answer

A)  7.96 * 10-2
B)  7.96 *10-1
C)  7.96 *100
D)  7.96 *01
E)  7.96 *10-3F) B) and C)
G) B) and E)

Question 5

To decrease the intensity of the sound you are hearing from your speaker system by a factor of 36, you can

Accepted Answer

A)  reduce the amplitude by a factor of 12 and increase your distance from the speaker by a factor of 3.
B)  reduce the amplitude by a factor of 4 and increase your distance from the speaker by a factor of 3.
C)  reduce the amplitude by a factor of 2 and increase your distance from the speaker by a factor of 3.
D)  reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 4.
E)  reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 12.F) A) and B)
G) B) and C)

Question 6

The variation in the pressure of helium gas, measured from its equilibrium value, is given by  Δ\DeltaΔ P = 2.9 * 10-5 cos (6.20x - 3 000t)  where x and t have units m and s, and  Δ\DeltaΔ P is measured in N/m2. Determine the frequency (in Hz)  of the wave.

Accepted Answer

A)  1500
B)  477
C)  1.01
D)  0.32
E)  239 F) None of the above
G) B) and C)

Question 7

A stone is thrown into a quiet pool of water. With no fluid friction, the amplitude of the waves falls off with distance r from the impact point as:

Accepted Answer

A)  1/r3
B)  1/r2
C)  1/r3/2
D)  1/r1/2
E)  1/rF) A) and E)
G) A) and D)

Question 8

The fundamental frequency of A above middle C on the piano is 440 Hz. This is the tenor high A, but a convenient note in the mid-range of women's voices. When we calculate the wavelength, we find that it is:

Accepted Answer

A)  much shorter than the length of either a man's or woman's lips.
B)  shorter than the length of a man's lips, but about the length of a woman's lips.
C)  longer than a woman's lips, but about the length of a man's lips.
D)  much longer than the length of either a man's or a woman's lips.
E)  about the same length as either a man's or woman's lips.F) None of the above
G) A) and B)

Question 9

If y = 0.02 sin (30x - 400t)  (SI units) , the frequency of the wave is:

Accepted Answer

A)  30 Hz
B)  15/  π\piπ  Hz
C)  200/  π\piπ  Hz
D)  400 Hz
E)  800  π\piπ  Hz F) B) and D)
G) A) and D) C

Question 10

A pulse is described by  y=3/[(x+2t) 2+4]y=3 /\left[(x+2 t) ^{2}+4\right]y=3/[(x+2t) 2+4]  in SI units. What is the velocity of the pulse?

Accepted Answer

A)  3 m/s in the +x direction
B)  2 m/s in the -x direction
C)  2 m/s in the +x direction
D)  4 m/s in the -x direction
E)  4 m/s in the +x direction F) A) and B)
G) B) and C)

Question 11

A jet plane has a sound level of 150 dB. What is the intensity in W/m2?

Accepted Answer

A)  1
B)  100
C)  10
D)  1000
E)  10°000F) B) and E)
G) A) and D)

Question 12

The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, and one-half wavelength occupies the string, what is the mass of the wire?

Accepted Answer

A)  0.025 kg
B)  0.049 kg
C)  0.051 kg
D)  0.081 kg
E)  0.037 kgF) D) and E)
G) B) and E)

Question 13

A wave generated in a medium is a longitudinal wave when:

Accepted Answer

A)  there is a net transport of matter by the wave.
B)  the molecules of the medium are unable to exert forces on each other.
C)  molecular displacements are parallel to the wave velocity.
D)  molecular displacements are perpendicular to the wave velocity.
E)  the density of the medium is less than the density of water.F) A) and E)
G) C) and D) C

Question 14

Refer to Exhibit 17-1 below.Exhibit 17-1 The figure below shows a sine wave on a string at one instant of time.  Which of the graphs below shows a wave where the frequency and wave velocity are both doubled?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and E)
G) B) and E)

Question 15

An aircraft travelling at half the speed of sound emits sound at a frequency of 5000 Hz. At what frequency does a stationary listener hear the sound as the plane approaches, and after it passes by? Assume the aircraft is not flying very high.

Accepted Answer

The answer of An aircraft travelling at half the speed...

Question 16

Refer to Exhibit 17-1 below.Exhibit 17-1 The figure below shows a sine wave on a string at one instant of time.  Which of the graphs below shows a wave where the wavelength is twice as large?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and C)
G) None of the above

Question 17

It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If the elastic modulus is 2.0*1011 N/m2 and the density of steel is 7.8 *103 kg/m3, approximately how many times faster is the speed of sound in the track than in air? (vair  ≈\approx≈  340 m/s.)

Accepted Answer

A)  20
B)  5
C)  10
D)  15
E)  25 F) C) and D)
G) A) and D)

Question 18

Find the period of a wave of 100-m wavelength in deep water where  v=gλ/2πv=\sqrt{g \lambda / 2 \pi}v=gλ/2π​  .

Accepted Answer

A)  5.0 s
B)  8.0 s
C)  12.5 s
D)  15 s
E)  0.125 s F) B) and C)
G) A) and B)

Question 19

If y = 0.02 sin (30x - 400t)  (SI units) , the velocity of the wave is:

Accepted Answer

A)  3/40 m/s.
B)  40/3 m/s.
C)  60  π\piπ /400 m/s.
D)  400/60  π\piπ  m/s.
E)  400 m/s. F) A) and E)
G) All of the above

Question 20

A boat sounds a fog horn on a day when both the sea water and the air temperature are 25.0  °\degree°  C. The speed of sound in sea water is 1533 m/s. How much earlier (in s)  does a dolphin 1000 m from the source hear the sound than a person in a boat that is also 1000 m distant? (Ignore the time it takes the sound to reach the water surface.)

Accepted Answer

A)  0.652
B)  2.12
C)  2.24
D)  2.77
E)  2.90 F) A) and E)
G) A) and B) C

Exam 17: Wave Motion

Write the equation of a wave, travelling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec.

Correct Answer
verified

If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they travelling?

Correct Answer
verified

The velocity of sound in sea water is 1.53 * 103 m/s. Find the bulk modulus (in N/m²) of sea water if its density is 1.03 *103 kg/m3.

Correct Answer
verified

A point source emits sound with a power output of 100 watts. What is the intensity (in W/m²) at a distance of 10.0 m from the source?

Correct Answer
verified

To decrease the intensity of the sound you are hearing from your speaker system by a factor of 36, you can

Correct Answer
verified

The variation in the pressure of helium gas, measured from its equilibrium value, is given by $\Delta$ P = 2.9 * 10-5 cos (6.20x - 3 000t) where x and t have units m and s, and $\Delta$ P is measured in N/m². Determine the frequency (in Hz) of the wave.

Correct Answer
verified

A stone is thrown into a quiet pool of water. With no fluid friction, the amplitude of the waves falls off with distance r from the impact point as:

Correct Answer
verified

The fundamental frequency of A above middle C on the piano is 440 Hz. This is the tenor high A, but a convenient note in the mid-range of women's voices. When we calculate the wavelength, we find that it is:

Correct Answer
verified

If y = 0.02 sin (30x - 400t) (SI units) , the frequency of the wave is:

Correct Answer
verified
C

A pulse is described by $y=3 /\left[(x+2 t) ^{2}+4\right]$ in SI units. What is the velocity of the pulse?

Correct Answer
verified

A jet plane has a sound level of 150 dB. What is the intensity in W/m²?

Correct Answer
verified

The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, and one-half wavelength occupies the string, what is the mass of the wire?

Correct Answer
verified

A wave generated in a medium is a longitudinal wave when:

Correct Answer
verified
C

Refer to Exhibit 17-1 below.Exhibit 17-1 The figure below shows a sine wave on a string at one instant of time. Which of the graphs below shows a wave where the frequency and wave velocity are both doubled?

Correct Answer
verified

An aircraft travelling at half the speed of sound emits sound at a frequency of 5000 Hz. At what frequency does a stationary listener hear the sound as the plane approaches, and after it passes by? Assume the aircraft is not flying very high.

Correct Answer
verified

Refer to Exhibit 17-1 below.Exhibit 17-1 The figure below shows a sine wave on a string at one instant of time. Which of the graphs below shows a wave where the wavelength is twice as large?

Correct Answer
verified

Correct Answer
verified

Find the period of a wave of 100-m wavelength in deep water where $v=\sqrt{g \lambda / 2 \pi}$ .

Correct Answer
verified

If y = 0.02 sin (30x - 400t) (SI units) , the velocity of the wave is:

Correct Answer
verified

Correct Answer
verified
C

Exam 17: Wave Motion

Write the equation of a wave, travelling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec.

Correct AnswerverifiedShow Answer

If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they travelling?

Correct AnswerverifiedShow Answer

The velocity of sound in sea water is 1.53 * 103 m/s. Find the bulk modulus (in N/m2) of sea water if its density is 1.03 *103 kg/m3.

Correct AnswerverifiedShow Answer

A point source emits sound with a power output of 100 watts. What is the intensity (in W/m2) at a distance of 10.0 m from the source?

Correct AnswerverifiedShow Answer

To decrease the intensity of the sound you are hearing from your speaker system by a factor of 36, you can

Correct AnswerverifiedShow Answer

The variation in the pressure of helium gas, measured from its equilibrium value, is given by Δ\DeltaΔ P = 2.9 * 10-5 cos (6.20x - 3 000t) where x and t have units m and s, and Δ\DeltaΔ P is measured in N/m2. Determine the frequency (in Hz) of the wave.

Correct AnswerverifiedShow Answer

A stone is thrown into a quiet pool of water. With no fluid friction, the amplitude of the waves falls off with distance r from the impact point as:

Correct AnswerverifiedShow Answer

The fundamental frequency of A above middle C on the piano is 440 Hz. This is the tenor high A, but a convenient note in the mid-range of women's voices. When we calculate the wavelength, we find that it is:

Correct AnswerverifiedShow Answer

If y = 0.02 sin (30x - 400t) (SI units) , the frequency of the wave is:

Correct AnswerverifiedC

A pulse is described by y=3/[(x+2t) 2+4]y=3 /\left[(x+2 t) ^{2}+4\right]y=3/[(x+2t) 2+4] in SI units. What is the velocity of the pulse?

Correct AnswerverifiedShow Answer

A jet plane has a sound level of 150 dB. What is the intensity in W/m2?

Correct AnswerverifiedShow Answer

The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, and one-half wavelength occupies the string, what is the mass of the wire?

Correct AnswerverifiedShow Answer

A wave generated in a medium is a longitudinal wave when:

Correct AnswerverifiedC

Refer to Exhibit 17-1 below.Exhibit 17-1 The figure below shows a sine wave on a string at one instant of time. Which of the graphs below shows a wave where the frequency and wave velocity are both doubled?

Correct AnswerverifiedShow Answer

An aircraft travelling at half the speed of sound emits sound at a frequency of 5000 Hz. At what frequency does a stationary listener hear the sound as the plane approaches, and after it passes by? Assume the aircraft is not flying very high.

Correct AnswerverifiedShow Answer

Refer to Exhibit 17-1 below.Exhibit 17-1 The figure below shows a sine wave on a string at one instant of time. Which of the graphs below shows a wave where the wavelength is twice as large?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Find the period of a wave of 100-m wavelength in deep water where v=gλ/2πv=\sqrt{g \lambda / 2 \pi}v=gλ/2π​ .

Correct AnswerverifiedShow Answer

If y = 0.02 sin (30x - 400t) (SI units) , the velocity of the wave is:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedC

Correct Answer
verified

Correct Answer
verified

The velocity of sound in sea water is 1.53 * 103 m/s. Find the bulk modulus (in N/m²) of sea water if its density is 1.03 *103 kg/m3.

Correct Answer
verified

A point source emits sound with a power output of 100 watts. What is the intensity (in W/m²) at a distance of 10.0 m from the source?

Correct Answer
verified

Correct Answer
verified

The variation in the pressure of helium gas, measured from its equilibrium value, is given by $\Delta$ P = 2.9 * 10-5 cos (6.20x - 3 000t) where x and t have units m and s, and $\Delta$ P is measured in N/m². Determine the frequency (in Hz) of the wave.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

A pulse is described by $y=3 /\left[(x+2 t) ^{2}+4\right]$ in SI units. What is the velocity of the pulse?

Correct Answer
verified

A jet plane has a sound level of 150 dB. What is the intensity in W/m²?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Find the period of a wave of 100-m wavelength in deep water where $v=\sqrt{g \lambda / 2 \pi}$ .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C