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.

10 rev/s

20 rev/s

24 rev/s

8 rev/s.

Correct Option

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1 year ago

Frequency= number of holes× velocity of wave
velocity = frequency/number of holes
velocity = 480/20 = 24 m/s

2 years ago

f = n \cdot \dfrac{v}{2}

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