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qUESTIONS

A car sounding a horn of frequency 1000 Hz passes a listener. The ratio of frequencies of the horn noted by the listener before and after passing of the car is 11: 9. If the speed of sound is ‘v’ the speed of the car is

A source is moving towards observer with a speed of 20 ms-1 and having frequency 240 Hz and observer is moving towards source with a velocity of 20 ms-1. What is the apparent frequency heard by observer, if velocity of sound is 340 ms-¹?

A source of sound and a person move away from each other with a speed of 10 m/s with respect to the ground. If the frequency of the sound from the source apparent to the person is n’, and the speed of sound in air is 350 m/s, the original frequency of the sound is

A car moving at 126 km/h approaches a factory which sounds a siren of frequency n. To the driver of the car, the frequency of the siren appears to be (Speed of sound in air = 350 m/s)

A simple harmonic wave of frequency 20 Hz is travelling along the positive x-axis with a velocity of 30 m/s. Two particles in the path of the wave, 0.45 m apart, difer in phase by

With what velocity a listener should move relative to a stationary source so that if f is the frequency emitted by the source, it appears to him as 2f ?

It takes 2.0 second for a sound wave to travel between two fixed points when the day temperature is 10 °C. If the temperature rises to 30 °C, the sound wave travels between the same two points is

A car moving at constant velocity sounds its horn (frequency n) as it passes by a pedestrian waiting to cross the road. Which of the following graphs correctly represents the frequency of the horn apparent to the pedestrian with respect to time t ?

A listener approaches a stationary source of sound at 20% of the speed of sound in air. The percentage increase in the apparent frequency is

On a windless day, when the speed of sound in air is v, a stationary highway police detects a drop of 12.5% in the pitch of the horn of a car. The car is

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