Question

A sound wave has a time period of $0.5\text{s}$. How many times does a particle pass through a given point in one second?

• A. $2$
• B. $0.5$
• C. $1$
• D. $4$

Answer 1

The correct option is A $2$

Number of times a particle will pass through a point in one second is defined as the frequency of wave, which is given by:
$f=\frac{1}{\text{T}}$, where $\text{T}$ is the time period of the wave.
$f=\frac{1}{0.5\text{s}}=2{\text{s}}^{-1}=2\text{Hz}$

Therefore, the number of waves passing through a point in one second is $2$.