Moving Sourse And Stationary Observer

a bus is moving towards and stationary observer with speed 20 m/s blows a horn of frequency 200 Hz. the frequency of sound heard by the observer is approximately ( take speed of sound 320 m/s)

When the source is moving towards the stationary observer, the apparent frequency is given by

A train is moving towards a stationary observer. Which of the following curve best represents the frequency recived by observer f aas afunction of time?

A source of frequency 1 kHz is moving towards a stationary observer with velocity of 0.9 times that of sound. What is the frequency heard by the observer ?

An aeroplane of frequency 2f is moving towards a stationary observer. Frequency heard by observer is 4f then find out ratio of speed of aeroplane and sound

A sound spurce is moving towards a stationary observer with 1/10 of the speed of sound. The ratio of apparent to real frequency is

A source is moving towards a stationary observer, so that the apparent frequency increases by 50%. If velocity of sound is 330 m/s, then velocity of source is

What should be the velocity of a sound source moving towards a stationary observer so that apparent frequency is double the actual frequency (Velocity of sound is v )