Question

The wavelength of infrasonics in air is of the order of

• A. $10^{0}m$
• B. $10^{1}m$
• C. $10^{-1}m$
• D. $10^{-2}m$

Answer 1

Answer: (B)

For infrasonics, frequency $n<20cm{s}^{-1}$
$\lambda =\frac{u}{n}>\frac{330}{20}\approx 10m$