Question 417: Waves

Question

Two sound waves having wavelengths $$5.0 \mathrm{~m}$$ and $$5.5 \mathrm{~m}$$ propagates in a gas with velocity 300 $$\mathrm{m} / \mathrm{s}$$. The number of heats produced per second is

Accepted Answer

$$\begin{aligned}
& \lambda_1=5.0 \mathrm{~m} 	ext { and } \lambda_2=5.5 \mathrm{~m}, \mathrm{v}=300 \mathrm{~m} / \mathrm{s} \
& \mathrm{n}_1=\frac{\mathrm{V}}{\lambda_1}=\frac{300}{5}=60 \mathrm{~Hz} \
& \mathrm{n}_2=\frac{\mathrm{V}}{\lambda_2}=\frac{300}{5.5}=54.5 \mathrm{~Hz} \simeq 54 \mathrm{~Hz}
\end{aligned}$$
Number of beats $$=\mathrm{n}_1-\mathrm{n}_2=60-54=6 \mathrm{~Hz}$$

Answer

six

Answer

two

Answer

three

Answer

one

Waves

Two sound waves having wavelengths $5.0 \mathrm{~m} and 5.5 \mathrm{~m} propagates in a gas with velocity 300 \mathrm{m} / \mathrm{s}$. The number of heats produced per second is

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