Speed = Frequency x Wavelength Transverse Wave Longitudinal Wave.

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Presentation transcript:

Speed = Frequency x Wavelength

Transverse Wave Longitudinal Wave

Waves with different frequencies F = 1 hz nodes F = 2 hz nodes F = 3 hz nodes

Interference

Doppler Effect

Bow Waves Bow Wave

Sonic Boom (shock wave)

-- Questions -- MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) A Doppler effect occurs when a source of sound moves towards you. away from you. both of these. D) none of these. 2) Some of a wave's energy dissipates as heat. In time, this will reduce the wave's A) amplitude. B) frequency. C) period. D) wavelength. E) speed.

3) Suppose a simple pendulum is suspended in an elevator 3) Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the frequency of the pendulum doesn't change. decreases. C) increases. 4) Wave interference occurs for A) light waves. B) water waves. C) sound waves. D) all of these. E) none of these.

5) 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) greater than the speed of sound. C) equal to the speed of sound. D) all of these. E) none of these. 6) A wave barrier is produced when a wave source moves A) faster than the waves it produces. B) as fast as the waves it produces. C) nearly as fast as the waves it produces.

7) 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 2 m. 4 m. 3 m. D) 1 m. 8) The stride of a horse depends somewhat on the pendulum-like swing of its legs. This stride would be higher in frequency if more of the mass in its legs were concentrated A) towards its feet. B) uniformly all along its legs. C) halfway up its legs. D) in the upper part, nearer the horse's body. E) none of these.

9) A node is a position of minimum amplitude. B) maximum amplitude. 10) The frequency of the second hand on a clock is 60 hertz. 1/60 hertz. C) 1 hertz.

11) If at a concert you run toward the orchestra, the frequency of the sound you hear will be A) increased. B) neither decreased nor increased. C) decreased. 12) The period of the second hand on a clock is A) 1 second. B) 1/60 second. C) 60 seconds. D) 3600 seconds. E) 12 hours.

13) To say that one wave is out of phase with another is to say that the waves are A) of different frequencies. B) out of step. C) of different amplitudes. D) of different wavelengths. E) all of these. 14) A pendulum clock at high altitudes runs A) normally as it does at sea level. B) fast. C) slow.

15) A tuning fork of frequency 200 hertz will resonate if a sound wave incident on it has a frequency of 100 hertz. 400 hertz. either of these. D) none of these. 16) A bow wave is produced when a wave source moves A) faster than the waves it produces. B) nearly as fast as the waves it produces. C) as fast as the waves it produces.

-- Answers -- MULTIPLE CHOICE. The one alternative that best completes the statement or answers the question.

Chapter 19 1) Answer: C 2) Answer: A 3) Answer: C 4) Answer: D 5) Answer: B 6) Answer: B 7) Answer: A 8) Answer: D 9) Answer: A 10) Answer: B 11) Answer: A 12) Answer: C 13) Answer: B 14) Answer: C 15) Answer: A 16) Answer: A