A) Audible wave
B) Infrasonic wave
C) Ultrasonic wave
D) None of the above
Correct Answer: C
Solution :
\[n=\frac{v}{\lambda }=\frac{300}{0.6\times {{10}^{-2}}}Hz\]\[=\frac{3}{6}\times {{10}^{4}}Hz=50,000Hz\] Þ Wave is ultrasonic.
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