Question

A source of wave produces $3$ crests and $3$ troughs in $2ms$, the frequency of the wave is

• A. $1250Hz$
• B. $1500Hz$
• C. $1000Hz$
• D. $750Hz$

Answer 1

The correct option is B $1500Hz$

source of wave produced 33 crests and 33 troughs means 3 times wavelength distanced is crossed in 2ms so time period of wave is

$T=\frac{.002}{3}$

so frequency(f) is

$f=\frac{3}{0.002}=1500$