A hospital uses an ultrasonic scanner to locate tumours

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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 tissue is close to

Frequency (n) = 4.2 MHz = 4.2 × 10⁶ Hz and
speed of sound (v) = 1.7 km/s = 1.7 × 10³ m/s.
Wave length of sound in tissue

(λ) =	v	=	1.7 × 10³	= 4 × 10^{- 4} m.
	n		4.2 × 10⁶