Question

vibrating object completes 450 oscillations in 15 seconds what is the frequency of vibrations of that object​

Answer 1

f=1/t
f= 1/15 = 0.666

Answer 2

The frequency of vibration is 30 Hz.

Explanation:

Number of oscillations, N = 450

Time, t = 15 s

We need to find the frequency of vibrations of that object. We know that the number of oscillation per unit time is called frequency of an object. So,

$f=\dfrac{n}{t}\\\\f=\dfrac{450}{15}\\\\f=30\ Hz$

So, the frequency of vibration is 30 Hz. Hence, this is the required solution.

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