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Ultrasonic waves of frequency 4.5 MHz are used to detect tumour in soft tissues. The speed of sound in tissue is 1.5 km s-1 and that in air is 340 m s-1. Find the wavelength of this ultrasonic wave in air and in tissue.

Ultrasonic waves of frequency 4.5 MHz are used to detect tumour in soft tissues. The speed of sound in tissue is 1.5 km s-1 and that in air is 340 m s-1. Find the wavelength of this ultrasonic wave in air and in tissue.

Grade:11

1 Answers

Deepak Patra
askIITians Faculty 471 Points
8 years ago
Sol. a) Given V base air = 340 m/s , n = 4.5 ×10^6 Hz ⇒λ base air = (340 / 4.5) × 10^–6 = 7.36 × 10¬^–5 m. b) V base tissue = 1500 m/s ⇒ λ base t = (1500 / 4.5) × 10^–6 = 3.3 × 10^–4 m.

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