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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Waves and Sound

Olympiad workbook · NSEP · Waves and Sound

A police car, moving at speed of 108 ~km / hour, approaches a truck...

A police car, moving at speed of

108 \mathrm{~km} /

hour, approaches a truck moving at

72 \mathrm{~km} /

hour in opposite direction. The natural frequency of the siren of the car is 800 Hz and the surrounding temperature is

27^{{}^{{}^{\circ}}} \mathrm{C}

. The frequency heard by the truck driver as the car passes him

Options

Aremains unchanged
Bdecreases nearly by 232 Hz
Cincreases nearly by 231 Hz
Ddecreases nearly by 260 Hz

Correct answer

B. decreases nearly by 232 Hz

Step-by-step solution

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