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Grade 11Wave Motion

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.

Profile image of Radhika Batra
12 Years agoGrade 11
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1 Answer

Profile image of Deepak Patra
12 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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