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Physics-

General

Easy

Question

The driver of a car travelling with speed 30 metres per second towards a hill sounds a horn of frequency $600 blank H z.$ If the velocity of sound in air is 330 metres per second, the frequency of the reflected sound as heard by the driver is

$720 H z$
$555.5 H z$
$550 H z$
$500 H z$

The correct answer is: $720 blank H z$

Frequency of reflected sound heard by the driver.
$n to the power of ´ end exponent equals n open square brackets fraction numerator v minus open parentheses negative v subscript o end subscript close parentheses over denominator v minus v subscript s end subscript end fraction close square brackets equals n open square brackets fraction numerator v plus v subscript o end subscript over denominator v minus v subscript s end subscript end fraction close square brackets equals n open square brackets fraction numerator v plus v subscript c a r end subscript over denominator v minus v subscript c a r end subscript end fraction close square brackets$
$equals 600 open square brackets fraction numerator 330 plus 30 over denominator 330 minus 30 end fraction close square brackets equals 720 blank H z$

Related Questions to study

An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at $50 blank k m divided by h comma$ and the enemy submarine at $70 blank k m divided by h.$ The Indian sub sends out a sonar signal (sound wave in water) at $1000 blank H z.$ Sonar waves travel at $5500 blank k m divided by h.$ What is the frequency detected by the Indian submarine

An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at $50 blank k m divided by h comma$ and the enemy submarine at $70 blank k m divided by h.$ The Indian sub sends out a sonar signal (sound wave in water) at $1000 blank H z.$ Sonar waves travel at $5500 blank k m divided by h.$ What is the frequency detected by the Indian submarine

physics-General

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