Question

calculate the frequency of a sound wave which vibrates 20 cycle in 5 seconds
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Answer 1

Answer:

Frequency is the number of vibration per second.

So in this case the frequency of the wave is:

f=

2.5

20

Hz =8 Hz

Answer 2

Answer:

simple

Explanation:

frequency means numbers of revolution per unit time (right!!!)...

so here just calculate number of cycles in 1sec.

so 20 in 5 => in 1sec , 20/5=4