Question

Pressure v/s Time graph of a sound wave is as shown below.
What will be the frequency of the sound wave?

• A. $2/3Hz$
• B. $1.5Hz$
• C. $1Hz$
• D. $2Hz$

Answer 1

The correct option is C $1Hz$

$3-$ half cycles are passing in $1.5$ seconds.
So, one half cycle will pass in, $-1.5/3=0.5sec$.
So one complete wave will pass in, $0.5\times 2=1sec$.
The time period of the given wave will be $1sec$
Since the frequency, $f=1/\text{Time period}$
$F=1/1=1Hz$.