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Class 11 NEET Physics Waves Questions Questions

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Question : 75 of 94

Marks: +1, -0

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

4×10−3m
8×10−3m
4×10−4m
8×10−4m.

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