When a jet plane is flying on elevation of 1000m the sound level on the ground 4.0 db. What would be the intensity level on the ground when its elevation is as low as 100m?
A car traveling at 20m/s blows its horn which has a frequency of 600 H. A stationary observer notices that the frequency of the horn changes considerably as the car passes by him. Calculate the change in frequency heard by the observer as the car approaches and moves away from the observer. (Given the velocity of sound in air is 330 m/s).
A stationary motion sends a wave of 150 kHz towards a truck approaching at a speed of 120 km/hr. What is the frequency of wave reflected back to the detector? (velocity of sound in air is 340 m/s)
A car is traveling at a speed of 600 km/hr sounds a horn of frequency 500 Hz. the sound is heard in another car traveling behind the first car in the same direction with a speed of 80 km/hr. What frequencies will the driver of the second car hear before and after overtaking the first car if the velocity of sound is 340 m/s?
A train is approaching a cliff at 20m/s. The driver sounds a whistle of frequency 800 Hz. What will be the frequency of an echo as heard by the driver? The velocity of sound in air is 350 m/s.
What is Doppler's effect? Obtain an expression for the apparent frequency of the sound when the source and observer both move in the same direction.
Define doppler's effect. Derive an expression for the change in frequency observed by a stationary observer when moving source just crosses the observer.
What is Doppler's effect? Find the change in the frequency when an observer moves towards a stationary source and then moves away from the source.
Describe sound wave as a pressure wave and deduce an expression for the pressure amplitude.
How are beats formed when two waves are superimposed? Deduce expression for the frequency of beats so formed.
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