Question

Beats are produced by frequencies $f_{1}$ and $f_{2}\left(f_{1} > f_{2}\right)$. The duration of time between two successive maxima or minima is equal to

• A. $ \frac{1}{f_{1} +f_{2}}$
• B. $ \frac{2}{f_{1}-f_{2}}$
• C. $ \frac{2}{f_{1} +f_{2}}$
• D. $ \frac{1}{f_{1}-f_{2}}$

Answer 1

Answer: (D)

The time-interval between two successive beats
$T=\frac{1}{\text { beat frequency }}=\frac{1}{f_{1}-f_{2}}$