Sound — Important Questions
ICSE · Class 8 · Physics
166 important questions from Sound for ICSE Class 8 Physics, with answers. Includes multiple choice and true false questions.
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Important Questions from Sound
A sound wave has amplitude 4 cm. If its amplitude is doubled, by what factor does its loudness change?
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4 times
Loudness is proportional to the square of amplitude. Doubling amplitude makes loudness 2^2 = 4 times.
A sound wave has amplitude 2 cm. If its amplitude is tripled, by what factor does its loudness change?
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9 times
Loudness ∝ a^2. Tripling amplitude makes loudness 3^2 = 9 times.
A tuning fork vibrates at 256 s^-1. What is its frequency in hertz?
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256 Hz
The frequency produced by the tuning fork is marked on it. 256 s^-1 means 256 Hz.
A tuning fork has a marked frequency of 480 s^-1. What is its frequency?
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480 Hz
The marked frequency is the frequency of the tuning fork. 480 s^-1 = 480 Hz.
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