Question

The time period of a vibrating body is $0.02s$. The frequency of waves it emits is :

• A. $5Hz$
• B. $20Hz$
• C. $200Hz$
• D. $50Hz$

Answer 1

The correct option is D

$50Hz$

Step 1: Given data

The time period of vibrating body, $T=0.02s$

Let, $f$ be the frequency of the wave.

Step 2: Formula used

The relation between frequency and time period is $f=\frac{1}{T}$

Step 3: Finding the frequency

$f=\frac{1}{T}$

$\Rightarrow f=\frac{1}{0.02}$

$\Rightarrow f=50Hz$

Hence, the correct option is (D),