Question

A guitar string makes $900$ oscillations in two seconds. Find its time period.

• A. 0.0011
• B. 0.0044
• C. 0.0088
• D. 0.0022

Answer 1

The correct option is D 0.0022

The number of oscillations in $2s=900$

Hence, the number of oscillations in $1s$, or, frequency, $f$ = $\frac{900}{2}=450s^{-1}$

We know that, time period, $T=\frac{1}{f}$
$\Rightarrow T=\frac{1}{450s^{-1}}=0.0022s$