Q. The minimum audible wavelength at room temperature is about
A) $0.2\ \mathring{\mathrm{A}}$
B) $5\ \mathring{\mathrm{A}}$
C) $5\ cm$ to $2\ metre$
D) $20\ mm$
Explanation
(d) Since maximum audible frequency is $20,000\ Hz,$
Hence $\lambda_{\min} = \frac{v}{n_{\max}} = \frac{340}{20,000} \approx 20\ mm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.