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NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Waves and Sound

NEET 2009 · Physics · Waves and Sound

The driver of a car traveling with speed 30 m / sec towards a hill...

The driver of a car traveling with speed 30 m/sec\mathrm{m} / \mathrm{sec} towards a hill sounds a horn of frequency 600 Hz600 \mathrm{~Hz}. If the velocity of sound in air is 330 m/s\mathrm{m} / \mathrm{s}, the frequency of reflected sound as heard by driver is :

Options

  1. A500 Hz500 \mathrm{~Hz}
  2. B550 Hz550 \mathrm{~Hz}
  3. C555.5 Hz555.5 \mathrm{~Hz}
  4. D720 Hz720 \mathrm{~Hz}

Correct answer

D. 720 Hz720 \mathrm{~Hz}

Step-by-step solution

\mathrmn′=v(c+uc−u)=600(330+30330−30)=720 Hz\begin{aligned} \mathrmn^{\prime}& =v\left(\frac{\mathrm{c}+\mathrm{u}}{\mathrm{c}-\mathrm{u}}\right)\\ & =600\left(\frac{330+30}{330-30}\right)=720 \mathrm{~Hz} \end{aligned}$$
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