Q. The wavelength of infrasonics in air is of the order of
A) $10^{0}m$
B) $10^{1}m$
C) $10^{- 1}m$
D) $10^{- 2}m$
Explanation
(b) For infrasonics, frequency $n < 20\ cms^{- 1}$
$\lambda = \frac{u}{n} > \frac{330}{20} = 15m = 10^{1}m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.