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Question

Ultrasonic waves of frequency 4.5 MHz are used to detect tumor in soft tissues. The speed of sound in tissue is 1.5 km s1 and that in air is 340 m s1. Find the wavelength of this ultrasonic wave in tissue.


A

333 m

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B

3.33 × 104 m

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C

1000 m

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D

10-4 m

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Solution

The correct option is B

3.33 × 104 m


frequency of wave =4.5×106 Hz

speed of sound in tissue =1.5×103 m/s

Wavelength =vf

1.5×1034.5×106=

0.333×103

3.33×104 m


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