Chapter 11

NCERT
Class 9
Science
Solutions
8. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Question:

The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Answer:

Frequency v = 100 Hz

time t = 1 minute = 60 seconds

∴ Number of vibrations = frequency × time

= 100 Hz × 60 seconds

= 600 vibrations

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