You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile b. half a mile
c. a tenth of a mile d. none of the above
[Ques. 2] Doppler radar can
a. catch speeders.
b. measure the speed of a pitcher's fastball.
c. detect tornadoes.
d. do all of the above.
[Ques. 3] You listen to a live orchestra concert from a cheap seat far away, high up in the balcony. The music seems to be a little out of sync with the conductor's beat. Why?
a. The musicians are paying no attention to the conductor.
b. You are noticing a time lag due to the finite speed of sound.
c. The orchestra is not very good.
d. The viola section is dragging.
[Ques. 4] The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m.
b. 0.0000034 m.
c. 0.00034 m.
d. 0.34 m.
e. 340,000,000 m.
[Ques. 5] Ultrasound is used
a. to form images of internal organs.
b. by bats to navigate.
c. in automatic focus cameras.
d. to control insects.
e. all of the above
[Ques. 6] In ultrasound the _____________ of the sound is much greater than in normal sound.
a. frequency
b. period
c. wavelength
d. amplitude
e. speed
[Ques. 7] Which of the following is not one of the ways sound can be used?
a. to circulate the refrigerant in a refrigerator
b. to relay information to orbiting satellites
c. to form images of internal organs
d. to measure the air temperature aloft
e. to make a bubble in water produce light
[Ques. 8] Choose the correct statement.
a. The perceived pitch of a sound usually doesn't depend on the sound's frequency.
b. The frequency of each musical note is 10 Hz higher than that of the next lower note.
c. The decibel is the standard measure of tone quality.
d. The perceived loudness of a sound depends somewhat on frequency.
[Ques. 9] As you move farther away from a source emitting a pure tone, the ___________ of the sound you hear decreases.
a. frequency
b. period
c. wavelength
d. amplitude
e. none of the above
[Ques. 10] 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
a. interference.
b. changing sound level.
c. diffraction.
d. the Doppler effect.
e. shock waves.
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