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Exam 6: Waves and Sound

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Question 31

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A huge explosion is heard 20 miles away. How long does it take the sound to travel that far? (20 miles = 32,000 meters)

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Question 32

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A sound with ten times the amplitude of another sound is judged to be ten times as loud.

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Question 33

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Regions of a longitudinal wave where the particles of the medium are squeezed together are called compressions.

Two examples of a transverse wave are __________ and __________.

A source emits sound at a fixed constant frequency f . If the temperature of the air rises, the frequency you hear is

Ultrasound is used

Reverberation can both inhibit conversation and enhance music.

A source emits sound at a fixed constant frequency f . If the source moves away from you, the frequency you hear is lower than f .

In order for two waves to interfere completely destructively, they must have the same amplitude.

An example of a longitudinal wave is

When a force F stretches a rope of mass per unit length ρ , the velocity of a wave in the rope is given by You have two ropes of the same length. The mass of the second rope is twice the mass of the first rope. The velocity of a wave in the second rope is times the velocity of a wave in the first rope.

In ultrasound the __________ of the sound is much greater than in normal sound.

Two uses of ultrasound are __________ and  __________.

A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is _________ times the frequency of the first wave.

A sound with ten times the amplitude of another sound is judged to be

When the frequency of the source of a water wave increases, the speed of the waves traveling in the water

A sound level of 80 dB has ___________ the amplitude of a 60 dB sound.

Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of diffraction.

A _________ wave is one with its oscillations perpendicular to the direction of propagation.

The figure shows a 'snapshot' of four different waves in identical ropes stretched with the same force. The waves with the largest wavelength are waves __________ and ___________.