Physics
WAEC 2021
A rotating disc contains a set of holes in a circle. An air jet is directed onto the holes and a note of frequency 480 Hz is produced. If the number of holes is 20, calculate the speed of rotation of the disc.
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A.
10 rev/s
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B.
20 rev/s
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C.
24 rev/s
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D.
8 rev/s.
Correct Answer: Option C
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