Question

The minimum audible wavelength at room temperature is about

[AFMC 1996]

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

Answer 1

The correct option is D

20 mm

Maximum frequency of audible range = 20 KHz
$\therefore V=\nu \lambda \lambda =\frac{V}{\nu }\therefore Minimumaudiblewavelength{\lambda }_{min}=\frac{V}{{\nu }_{max}}=\frac{330}{20\times {10}^3}=20mm$