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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 the tissue is close to

Answer»

`4 xx 10^(-3)` m
`8 xx 10^(-3) `m
`4 xx 10^(-4)` m
`8 xx 10^(-4)` m

Solution :Frequency `(V) = 4.2 MHZ = 4.2 xx 10^(6) Hz` and SPEED of SOUND `(v) = 1.7 km//s = 1.77 xx 10^(3)` m//s
Wavelength of sound in tissue `(lambda) = v/u =(1.7 xx 10^(3))/(4.2 xx 10^(6))`
`=4 xx 10^(-4)` m


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