A rotating disc contains a set of holes in a circle. An air jet is...
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.
- A. 10 rev/s
- B. 20 rev/s
- C. 24 rev/s
- D. 8 rev/s.
Correct Answer: C. 24 rev/s
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