Physics: Chapter 16 Sound

1. Sound is produced by __________ objects.

2. A sound wave is a __________ wave.

3. At normal atmospheric pressure and room temperature, the velocity of sound in air is __________ m/s.

4. The frequency of a sound wave is called its __________.

5. The __________ of a sound wave determines its loudness.

6. The loudness of a sound is measured in __________.

7. An air column which vibrates with the same frequency as a sound source is said to be in __________ with the source.

8. In a __________ wave, the locations of maximum and minimum air pressure are stationary.

9. In such waves, the locations of maximum and minimum pressures are called __________.

10. The minimum length of a resonating open pipe is __________ wavelength(s).

11. The minimum length of a resonating closed pipe is __________ wavelength(s).

12. Two waves of slightly different frequencies produce a __________.

13. The quality of a sound wave is called its __________.

14. The lowest frequency produced by an instrument is called the __________.

15. Waves of higher frequencies produced by an instrument are called __________.

16. The apparent shift in frequency caused by the relative motion between a sound source and detector is called the __________ shift.

1. Sound waves cannot travel through

a. air.

b. water.

c. wood.

d. vacuum.

2. As one rapidly approaches a sound source

a. the frequency increases.

b. the wavelength increases.

c. the velocity increases.

d. the amplitude decreases.

3. An open pipe will resonate if its length is

a. ¼.

b. ½.

c. ¾.

d. ¹/₃.

4. To double the loudness of a sound, the amplitude of the sound wave must be increased by a factor of

a. 2.

b. 4.

c. 10.

d. 20.

5. Middle C on the piano has a frequency of 256 Hz. High C, one octave above, has a frequency of

a. 256 Hz.

b. 257 Hz.

c. 264 Hz.

d. 512 Hz.

6. Chimes are often made of open and closed pipes. Which chime will produce the highest pitched sound?

7. The range of audibility for most people is from 20Hz to

a. 200 Hz.

b. 160 Hz.

c. 1600 Hz.

d. 16000 Hz.

8. Two sounds have frequencies of 340 Hz and 344 Hz respectively. The beat frequency will be

a. 684 Hz.

b. 300 Hz.

c. 4 Hz.

d. 40 Hz.

9. A clarinet plays a musical note of fundamental frequency 200 Hz. The frequency of the second overtone is

a. 400 Hz.

b. 600 Hz.

c. 800 Hz.

d. 100 Hz.

10. The number and relative intensities of the overtones produced when a musical instrument plays a note determines the __________ of the sound.

a. timbre (tone quality)

b. loudness

c. fundamental

d. pitch