First slide

Experiments to find speed of sound

Question

What would be the wavelength of a sound wave in iron (V = 4950 m/sec) if its wavelength was 1.4 m in air in which its speed was 330 m/sec.

Easy

A

0.29
B

21 m
C

17 m
D

18 m

Solution

$\begin{array}{l} \frac{v_{1}}{v_{2}} = \frac{λ_{1}}{λ_{2}} \Rightarrow λ_{2} = \frac{v_{2}}{v_{1}} λ_{1} \\ \Rightarrow λ_{2} = \frac{4950}{330} \times 1.4 = 21 m \end{array}$

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