JEE PHYSICS MCQ: WAVES

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Application +4 | -1

Ultrasonic waves of frequency

4.5 \mathrm{MHz}

are used to detect tumour in soft tissues. The speed of sound in tissue is

1.5 \mathrm{~km} \mathrm{~s}^{-1}

and that in air is

340 \mathrm{~ms}^{-1}

. Find the wavelength of this ultrasonic wave in air and in tissue.

View answer and explanation

Correct option: A

7.36 \times 10^{-5} \mathrm{~m};\,\,3.3 \times 10^{-4} \mathrm{~m}

Option A (

7.36 \times 10^{-5} \mathrm{~m};\,\,3.3 \times 10^{-4} \mathrm{~m}

) is correct because it correctly calculates the wavelengths in air and tissue using the given speeds and frequency.

More Questions from WAVES

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3\,\,kHz

0.5

f\mathrm{ }Hz

V\mathrm{ }m/sec

0.2\,\,V

y = \frac{3}{{{{\left( {2x + 3t} \right)}^2} + 4}},

(– \mathrm{ve}) \,x

y = f(kx +\omega t),

X

0.01\,\,s

5 \mathrm{~m}

245 \mathrm{~g}

1 \mathrm{~kg}

g=980 \mathrm{~cm} \mathrm{~s}^{-2}

T

V