Q. A 1000 Hz sound wave in air strikes the surface of a lake and penetrates into water. If speed of sound in water is $1500ms^{- 1}$,the frequency and wavelength of waves in water are
A) 1500 Hz, 1m
B) 1000 Hz, 1.5m
C) 1000 Hz, 1m
D) 1500 Hz, 1.5m
Explanation
(b) Frequency remains the same $ie$ $1000\ Hz$ wavelength chances
$\lambda_{\omega} = \frac{v_{\omega}}{V} = \frac{1500}{1000} = 1.5\ m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.