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JIPMER 2014
Exam
JIPMER
Year
2014
Subject
Physics
Chapter
Waves and Sound

JIPMER 2014 · Physics · Waves and Sound

A sound source producing waves of frequency 300 Hz and wavelength 1...

A sound source producing waves of frequency 300 Hz and wavelength 1 m observer is stationary, while source is going away with the velocity 30 m/s30 \mathrm{~m} / \mathrm{s}, then apparent frequency heared by the observer is

Options

  1. A270 Hz270\mathrm{~Hz}
  2. B273 Hz273\mathrm{~Hz}
  3. C383 Hz383\mathrm{~Hz}
  4. D300 Hz300\mathrm{~Hz}

Correct answer

B. 273 Hz273\mathrm{~Hz}

Step-by-step solution

Apparent frequency n′=n(vv+vs)n^{\prime}=n\left(\frac{v}{v+v_s}\right)v= velocity of  sound, vs= velocity of source \begin{aligned} v & =\text{ velocity\text{ of } sound, } \\ v_s & =\text{ velocity of source }\end{aligned}∴n′=300(332332+30)=273 Hz\therefore \quad n^{\prime}=300\left(\frac{332}{332+30}\right)=273 \mathrm{~Hz}
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