NEET Physics Basic of Mechanical Waves Progressive and Stationary Waves Online Test Set B

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Question 1

Question

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. The wavelength of sound in tissue is close to

Answer

8 × 10–3 m

4 × 10–4 m

4 × 10–3 m

8 × 10–4 m