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 (a) 4 × 10⁻³ m (b) 8 × 10⁻³ m (c) 4 × 10⁻⁴ m (d) 8 × 10⁻⁴ m

Answer: (c). λ = v/n λ = 1.7 × 10³4.2 × 10⁶ ≈ 4.0 × 10⁻⁴ m So the answer is (c) 4 × 10⁻⁴ m.

A hospital uses an ultrasonic scanner to locate tumours in a tissue… | NEET 1995 (AIPMT)

Q41NEET 1995 · AIPMTEasy

Wave Basics & Properties of Sound

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is $4.2\text{ MHz}$ . The speed of sound in a tissue is $1.7\text{ km/s}$ . The wavelength of sound in the tissue is close to

Show answer and solution

Answer: (c)

$\lambda = \frac{v}{n}$
$\lambda = \frac{1.7 \times 10^{3}}{4.2 \times 10^{6}} \approx 4.0 \times 10^{-4}$ m
So the answer is (c) $4 \times 10^{-4}$ m.

Report a mistake

Wave Basics & Properties of Sound question from NEET 1995 (AIPMT)

More questions on Wave Basics & Properties of Sound