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

Question

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

Tardigrade Admin · Accepted Answer

Frequency (v)=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/v)=(1.7 × 103/4.2 × 106) =4 × 10-4 m.

Q. A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is $4.2 M Hz$ . The speed of sound in a tissue is $1.7 km / s$ . The wavelength of sound in the tissue is close to

$4 \times 1 0^{- 3} m$

$8 \times 1 0^{- 3} m$

$4 \times 1 0^{- 4} m$

$8 \times 1 0^{- 4} m$

Frequency $(v) = 4.2 M Hz = 4.2 \times 1 0^{6} Hz$
and speed of sound $(v) = 1.7 km / s = 1.7 \times 1 0^{3} m / s$ .
Wave length of sound in tissue $(λ) = \frac{v}{v} = \frac{1.7 \times 1 0 ^{3}}{4.2 \times 1 0 ^{6}}$ $= 4 \times 1 0^{- 4} m$ .

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

4×10−3m

8×10−3m

4×10−4m

8×10−4m