Question

In: Physics

1. The intensity of a sound decreases by a factor of 4. As a result, the...

1.

The intensity of a sound decreases by a factor of 4. As a result, the sound intensity level decreases by ______.

	4 dB
	16 dB
	6 dB
	8 dB

2.

The human threshold of pain is about how many decibels?

	80 dB
	140 dB
	100 dB
	120 dB

3.

Two sinusoidal sound waves with slightly different frequencies combine to form a third sound wave called a beat. How does the amplitude of the beat change over time, or does it remain constant?

	The amplitude increases and decreases in a sinusoidal pattern.
	The amplitude increases indefinitely.
	The amplitude remains constant.
	The amplitude changes in a pattern of a steady increase, then a sudden decrease.

4.

Two audio speakers produce, in step, the same sinusoidal sound of wavelength λ. A listening device is positioned at point Q in the room and registers no sound from the speakers. What characterizes the two sound waves as they arrive at point Q? Assume the room is anechoic (produces no echoes.)

	One wave has twice the amplitude of the other wave.
	The two waves are a half-cycle out of step.
	One wave has twice the frequency of the other wave.
	The two waves are a full cycle out of step.

5.

At an auto race, a member of the pit crew stands beside the track. A car approaches him at 110 m/s and emits a sound at frequency 1200 Hz. The air is still and the speed of sound is 340m/s. What frequency will the pit crew member hear?

	907 Hz
	811 Hz
	1590 Hz
	1770 Hz

6.

The frequency of the faintest audible sound is about 1,000 Hz. What is the pressure variation corresponding to this sound?

	3 x 10^-5 Pa
	30 Pa
	5 x 10^-2 Pa
	1 x 10^-12 Pa

7.

Two loudspeakers are placed 4.5 m apart. They produce the same sounds, in step, across a frequency range of 744 Hz to 992Hz Point P is located 5.30m from one loudspeaker and 3.60m from the other. What frequency of sound from the two speakers will produce destructive interference at point P? Assume the speed of sound is 344m/s

	971 Hz
	890 Hz
	931 Hz
	911 Hz
	951 Hz

8.

Two loudspeakers are placed 6.0 m apart. They produce the same sounds, in step, across a frequency range of 252Hz to 665Hz Point P is located 5.10m from one loudspeaker and 3.60m from the other. What frequency of sound from the two speakers will produce constructive interference at point P? Assume the speed of sound is 344m/s

	573 Hz
	459 Hz
	631 Hz
	401 Hz
	516 Hz

Expert Solution

genius_generous answered 1 year ago

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