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4. A traffic policeman uses a whistle rather than a horn because it produces
a. a low-pitched sound.
b. a high-pitched sound.
c. a low frequency sound.
d. a high amplitude sound.
5. One characteristic of the loud drumming sound produced by a drum is
a. high pitch and high amplitude.
b. low pitch and low amplitude.
c. low pitch and high amplitude.
d. high pitch and low amplitude.
6. Timbre of a sound changes when changes occur in the
a. pitch.
b. nature of overtones.
c. loudness.
d. wavelength.
SUBJECTIVE
1. Raj pumped hot air into his room. What will happen to the speed of sound?
2. What will be the Velocity of sound waves of frequency 200 vibrations per second
at a place in the air medium when compared with the velocity of sound waves of
frequency 400 vibrations per second?
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