A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km-s–1. The wavelength of sound in the tissue is close to

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4×10−4 m

8×10−3 m

4×10−3 m

8×10−4 m

answer is A.

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Detailed Solution

λ=vn=1.7×10004.2×106=4×10−4m

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