[AFMC 1996]
A) 0.2 Å
B) 5 Å
C) 5 cm to 2 metre
D) 20 mm
Correct Answer: D
Since maximum audible frequency is 20,000 Hz, hence $ {\lambda _{\min }}=\frac{v}{{n _{\max }}}=\frac{340}{20,000}\approx 20 $
$ mm $
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