Question

The minimum audible wavelength at room temperature is about

• A. 0.2 Å
• B. 5 Å
• C. 5 cm to 2 metre
• D. 20 mm

Answer 1

Answer: (D)

20 mm

Answer 2

Since maximum audible frequency is 20,000 Hz, hence

${\lambda\frac{v}{n_{\max}\frac{340}{20,000}}}_{\min}mm$