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.
Radhika Batra , 11 Years ago
Grade 11
1 Answers
Deepak Patra
Last Activity: 11 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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