Physics Chapter 19 – Flashcards

1) A wiggle in time is a A) vibration. B) wave. C) both D) neither

2) A fishing-boat captain returns to port saying, "It's rough out there - the waves are 4 meters high." He probably means that the amplitude of the waves is A) 4 m. B) 3 m. C) 2 m. D) 1 m.

3) The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is A) 0.5 m. B) 1 m. C) 2 m. D) none of these

4) How many vibrations per second are associated with a 101-MHz radio wave? A) less than 101,000,000 B) 101,000,000 C) more than 101,000,000

5) If you double the frequency of a vibrating object, its period A) doubles. B) halves. C) is quartered.

6) The pendulum with the greatest frequency is the pendulum with the A) shortest period. B) shortest length. C) shortest amplitude. D) greatest amplitude

7) A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency? A) 0.5 hertz B) 1 hertz C) 2 hertz D) 3 hertz E) 6 hertz

8) A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is A) 30 hertz and it travels at 60 m/s. B) 60 hertz and it travels at 30 m/s. C) 1800 hertz and it travels at 2 m/s.

9) An object that completes 10 vibrations in 20 seconds has a frequency of A) 0.5 hertz. B) 2 hertz. C) 200 hertz.

10) An object that completes 20 vibrations in 10 seconds has a frequency of A) 0.5 hertz. B) 1 hertz. C) 2 hertz. D) 200 hertz.

11) An object that completes 100 vibrations in 5 seconds has a period of A) 0.5 second. B) 1 second. C) 2 seconds. D) None of the above choices are correct.

12) A weight suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is A) 0.5 hertz. B) 1 hertz. C) 2 hertz. D) None of the above choices are correct.

13) If the frequency of a certain wave is 10 hertz, its period is A) 0.1 second. B) 10 seconds. C) 100 seconds. D) None of the above choices are correct.

14) A common source of wave motion is a A) wave pattern. B) harmonic object. C) vibrating object. D) region of variable high and low pressure. E) none of these

15) As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave? A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 2 m/s E) 4 m/s

16) A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves? A) 3 m/s B) 5 m/s C) 15 m/s D) not enough information given

17) Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is A) 0.3 m. B) 3.0 m. C) 30 m. D) 300 m. E) none of these

18) A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed? A) 2 m/s B) 10 m/s C) 20 m/s D) 40 m/s E) more than 40 m/s

19) A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is A) 2 m/s. B) 5 m/s. C) 10 m/s. D) 15 m/s. E) none of these

20) A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is A) 0.5 m. B) 1 m. C) 2 m. D) 3 m. E) 6 m.

21) Like a transverse wave, a longitudinal wave has A) amplitude, frequency, wavelength, and speed. B) amplitude, frequency, and wavelength. C) amplitude, wavelength, and speed. D) wavelength, speed, and frequency. E) amplitude, frequency, and speed.

22) Which of the following is not a transverse wave? A) sound B) light C) radio D) all of these E) none of these

23) The vibrations of a transverse wave move in a direction A) along the direction of wave travel. B) at right angles to the direction of wave travel. C) that changes with speed.

24) In a longitudinal wave the compression and rarefaction travel in A) the same direction. B) opposite directions. C) a vacuum.

25) The vibrations of a longitudinal wave move in a direction A) along the direction of wave travel. B) at right angles to the direction of wave travel. C) that changes with speed.

26) Wave interference occurs for A) sound waves. B) light waves. C) water waves. D) All of the above choices are correct. E) None of the above choices are correct.

27) To say that one wave is out of phase with another is to say that the waves are A) of different amplitudes. B) of different frequencies. C) of different wavelengths. D) out of step. E) all of these

28) A standing wave occurs when A) two waves overlap. B) a wave reflects upon itself. C) the speed of the wave is zero or near zero. D) the amplitude of a wave exceeds its wavelength.

29) A node is a position of A) minimum amplitude. B) maximum amplitude. C) half amplitude.

30) A Doppler effect occurs when a source of sound moves A) towards you. B) away from you. C) either towards you or away from you. D) in a circle around you.

31) The Doppler effect is characteristic of A) water waves. B) sound waves. C) light waves. D) all of the above choices E) none of the above choices

32) A wave barrier is produced when a wave source moves A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces.

33) A bow wave is produced when a wave source moves A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces.

34) An observer on the ground hears a sonic boom which is created by an airplane flying at a speed A) just below the speed of sound. B) equal to the speed of sound. C) greater than the speed of sound. D) All of the above choices are true. E) None of the above choices are true.

35) An aircraft that flies faster than the speed of sound is said to be A) subsonic. B) supersonic. C) impossible.

36) As a supersonic craft increases in speed, the angle of its V-shaped shock wave becomes A) wider. B) narrower. C) neither

37) The sonic boom at ground level produced by an aircraft will be reduced if the aircraft A) is smaller, flies higher, and is more streamlined. B) flies higher. C) is more streamlined. D) is smaller. E) None of the above choices are true.

38) A jet traveling at 1500 km/hr passes between observers A and B. In a short time a sonic boom will be heard by A) observer A, observer B, and the pilot of the jet. B) observer A only. C) observer B only. D) observers A and B, but not the pilot.