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1. | The disc of a siren containing 60holes rotates at a constant speed of 360rpm. The emitted sound is in unison with a tuning fork of frequency. | |
A. | 10Hz | |
B. | 360Hz | |
C. | 216Hz | |
D. | 60Hz | |
Answer: Option B | |
Explanation: | |
Frequency of revolution of disc=360rpm=360/60rps=60rps |
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