Question

A person bangs on a copper pipe that is part of a large warehouse. The sound can be heard in the pipe $100.0$ meters away in $0.02174$ seconds.
If the frequency of the sound is $500.0Hz$, what is the wavelength of the second wave in the copper pipe?

• A. $1087m$
• B. $0.187m$
• C. $9.200m$
• D. $0.004348m$
• E. $2,300,000m$

Answer 1

Answer: (C)

$9.200m$

Speed of wave is distance covered by wave per unit time=$v=\frac{100m}{0.02174s}$

Hence from $v=\lambda \nu$

$⟹\lambda =\frac{v}{\nu }=\frac{100/0.02174}{500}=9.200m$