Title: Waves
Course: Physics copy 1

Q: Which one of the following properties of a wave decreases as the wave moves along a spring?
- amplitude
- wavelength
- speed
- frequency
- period
A: amplitude

Q: The diagram below shows a portion of a rope in which a disturbance XY travels in the direction of the arrow.
[Image: wave on a rope]
The instantaneous velocity of a particle of the rope at point P is best represented by which one of the following vectors?
[Image: motion of particle]
- A
- B
- C
- D
- E
A: A

Q: The sketches below show different situations with a pendulum which is about to be released.
[Image: pendulum with bobs]
You want to test this idea: the more mass the bob of the pendulum has, the more time it will take to come to rest. Which three tests would you use?
- s t v
- w x z
- r u z
- v x y
- r u y
A: r u y

Q: The wavelength of a transverse wave train is 20 cm and its amplitude is 4 cm. At a point P the displacement is -4 cm. At the same instant, at point Q, 25 cm away in the direction of propagation of the wave, the displacement is
- 0 cm
- 2 cm
- -2 cm
- 4 cm
- -4 cm
A: 0 cm

Q: A source S generates circular waves on a lake.
[Image: man in a boat]
The pattern of wave crests is shown in the diagram below. If the frequency of the source is 2.0 Hz and the wave speed is 5.0 m/s then the distance between adjacent wave crests is
- 0.20 m
- 0.40 m
- 1.25 m
- 2.5 m
- 10 m
A: 2.5 m

Q: A source S generates circular waves on a lake The pattern of wave crests is shown in the diagram below.
[Image: source]
The speed of the waves is 5.0 m/s, and the crest-tocrest separation is 2.0 m. A man in a motor boat heads directly toward S with a constant speed of 3.0 m/s. To the man, the apparent frequency of the waves is
- 1.0 Hz
- 1.5 Hz
- 2.0 Hz
- 4.0 Hz
- 8.0 Hz
A: 4.0 Hz

Q: A rope 2 m long is hanging vertically from a vibrator. It is noted that a single pulse travels to the end of the rope in 0.5 s. What frequency should be used in the vibrator to maintain three whole waves in the rope?
- 4 Hz
- 3 Hz
- 4 Hz
- 6 Hz
- 8 Hz
A: 6 Hz

Q: A wave whose speed in a spring is 4.4 m/s enters a second spring. The wavelength changes from 2.0 m to 3.0 m. The wave in the second spring travels at
- 1.46 m/s
- 2.2 m/s
- 2.9 m/s
- 4.4 m/s
- 6.6 m/s
A: 6.6 m/s

Q: A vibrating source in a ripple tank produces straight waves having a frequency of 15 Hz. Using a 5-slit stroboscope to stop the motion, it is found that the distance between successive crests is 2 cm. The speed of the waves is
- 6.0 cm/s
- 7.5 cm/s
- 30 cm/s
- 37.5 cm/s
- 150 cm/s
A: 30 cm/s

Q: What is the wavelength of radar waves of frequency 3000 MHz? The speed of light is 3 x 10^8 m/s.
- 10^5 m
- 10^2 m
- 10 m
- 10^-1 m
- 10^-2 m
A: 10^2 m

Q: The graph below shows speed versus distance for waves generated in a water tank. Recall that the speed of water waves increases with the depth. The frequency of the waves is
- the same in all sections
- greatest in section IV
- variable in section III
- lower in section I than in section III
- greatest in section II
A: the same in all sections

Q: The graph below shows speed versus distance for waves generated in a water tank.

[Image: depth with distance]
Recall that the speed of water waves increases with the depth. Assume that the walls of the tank are perfectly absorbing. Which one of the following wave patterns,as viewed from above, could result from waves generated in the tank?
[Image: waves with different seperations]
- A
- B
- C
- D
- E
A: C

Q: A vibrating source in a ripple tank produces straight waves having a frequency of 15 Hz. Using a 5-slit stroboscope to stop the motion, it is found that the distance between successive crests is 2 cm. The minimum rate of rotation required for the stroboscope to stop the wave motion is
- 15 Hz
- 3 Hz
- 3 Hz
- 15 Hz
- 75 Hz
A: 3 Hz

Q: Water waves generated in a ripple tank are observed to have crests 5.0 cm apart. The speed of the waves is 20 cm/s. How long does it take for a new wave to be generated?
- 100 s
- 4.0 s
- 2.0 s
- 0.50 s
- 0.25 s
A: 0.25 s

Q: A narrow beam of light travels from a vacuum into a substance S at an angle of incidence of 45
- less than the wavelength in S
- 3.00 /1.41 x 10^-8 m
- 5.00 x 10^14 m
- 3.55 x 10^-7m
- 5.00 x 10^-5 m
A: 5.00 x 10^14 m

Q: Light travelling at a speed of 3.0 x 10^8m/s in a medium in which its wavelength is 6.0 x 10^-7 m has a frequency of
- 2.0 x 10^-15 Hz
- 1.8 x 10^2Hz
- 5.0 x 10^14Hz
- 2.0 x 10^15Hz
- 5.0 x 10^15Hz
A: 5.0 x 10^14Hz

Q: Which of the following statements correctly describes the changes that occur in a sound wave when it passes from cool air into warmer air?
- The speed, wavelength, and frequency all increase.
- The speed and wavelength increase, and the frequency decreases.
- The speed and wavelength decrease, and the frequency remains constant.
- The speed and wavelength increase, and the frequency remains constant.
- The speed and frequency increase, and the wavelength decreases.
A: The speed and wavelength increase, and the frequency remains constant.