A whistle of frequency `f_(0)=1300Hz` is dropped from a height H=505 m above the ground. At the same time,a detector is projected upwards with velocity `u=50ms^(-1)` along the same line.If the velocity of sound is `V=300ms^(-1)` The frequency detected by the detector after t=5s is

A ball is dropped from top of a tower 250 m high. At the same time, another ball is thrown upwards with a velocity of 50 ms^(-1) from the ground. The time at which they cross each other is

A stone is dropped from a height of 100m .At the same instant another stone is projected vertically upwards with velocity of 50ms^(-1) .If g=10ms^(-2) ,the height from the ground at which the 2 stones meet is

If the same time taken for the reflected sound to reach the sonar os 2 s, the depth of the sea is _______ m. (velocity of sound in water is 1500 ms^(-1) )

A sound source emitting sound of frequency 450 Hz is approaching a stationary observer with velocity 30 ms^(-1) and another identical source is going away from the observer with the same velocity. If the velocity of sound is 330 ms^(-1) , then the difference of frequencies heard by observer is

Form the top of a tower 100 m in height a ball is dropped and at the same time another ball is projected vertically upwards from the ground with a velcoity of 25 ms^(-1) . Find when and where the two balls will meet.

A stone is dropped from the top of a 400 m high tower. At the same time another stone is projected vertically upwards from the ground with a speed of 50 m//s . The two stones will cross each other after a time

A source of sound is moving away from an observer at rest with a velocity of 50 m s^(-1) . If the frequency of sound is 200 Hz , find the apparent frequency observed by the observer. (Take velocity of sound = 300 m s^(-1))

A policeman blos a whistle of frequency 400Hz as a car speeds past him with a velocity of 54km h^(-1) . Find the cahnge in frequency as heard by the driver of the car just as he passes the policeman. Velocity of sound in air is 350ms^(-1)