The minimum audible wavelength at room temperature is about - Vidyadip

MCQ

The minimum audible wavelength at room temperature is about

A
$0.2\ \mathring A$
B
$5\ \mathring A$
C
$5 \mathrm{~cm}$ to $2$ metre
✓
$20 \mathrm{~mm}$

✓

Answer

Correct option: D.

$20 \mathrm{~mm}$

Since maximum audible frequency is $20,000 \mathrm{~Hz}$,
hence $\lambda_{\min}=\frac{v}{n_{\max }}=\frac{340}{20,000} \approx 20 \mathrm{~mm}$

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