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Question: A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the ...

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

A

4×10−4m4 \times 10^{- 4}m

B

8×10−3m8 \times 10^{- 3}m

C

4×10−3m4 \times 10^{- 3}m

D

8×10−4m8 \times 10^{- 4}m

Answer

4×10−4m4 \times 10^{- 4}m

Explanation

Solution

λ=vn=1.7×10004.2×106=4×10−4m\lambda = \frac{v}{n} = \frac{1.7 \times 1000}{4.2 \times 10^{6}} = 4 \times 10^{- 4}m