Question

(c)A stretched string takes 20 sec to complete 200 oscillations. What is
the frequency of it?
i) 100 hz
ii) 220 hz
iii)50 hz
iv)10 hz
In the given question there are two statements labeled as Assertion (A) and​

Answer 1

220 this is your answer

Answer 2

Given:

A stretched string takes 20 sec to complete 200 oscillations.

To find:

Frequency of string?

Calculation:

Frequency is the total number of oscillations completed in one second.

• The string completes 200 oscillations in 20 seconds.

So, frequency is :

$\rm \: frequency = \dfrac{total \: oscillations}{time \: taken}$

$\rm \implies \: frequency = \dfrac{200}{20}$

$\rm \implies \: frequency = 10 \: hz$

So, frequency of string is 10 Hz (Option iv)