Question:
The disc of a siren containing $60$ holes rotates at a constant speed of $360\, rpm$. The emitted sound is in unison with a tuning fork of frequency :
The disc of a siren containing $60$ holes rotates at a constant speed of $360\, rpm$. The emitted sound is in unison with a tuning fork of frequency :
Updated On: Apr 14, 2026
- 10 Hz
- 360 Hz
- 216 Hz
- 60 Hz
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The Correct Option is B
Solution and Explanation
Number of holes in the disk determines the number of waves produced on each rotation $= 60$
The total number of waves per second determines the frequency of the sound.
So frequency $=60 \times \frac{360}{60}=360 \,Hz$
The total number of waves per second determines the frequency of the sound.
So frequency $=60 \times \frac{360}{60}=360 \,Hz$
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