Q.

The wavelength of ultrasonic waves in air is of the order of

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a

5×10−5 cm

b

5×10−8 cm

c

5×105 cm

d

5×108 cm

answer is A.

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Detailed Solution

λ=vn ; n≈50,000 Hz, v=330 m/sec⇒λ=33050000 m=6.6×10−5cm≈5×10−5cm
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