A car while travelling produces noise of intensity level of `94` decibel. At a particular point on road maximum permissible level of noise is `100` decibel. Find how many such identical car can be allowed to pass through that point simutaneously if sound waves emitted by all cars in same phase at that point? (Use `log2=0.3`)

In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water. What is the distance between car and atone at the instant when particle reaches at point B ?

In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water. What is the distance between car and atone at the instant when particle reaches at point B ?

Source waves are emitted uniformly in all directions from a point source. The dependence of sound level beta in decibels on the distance r can be expressed as (a and b are positive constants)

A point source is emitting sound in all directions. The ratio of distance of two points from the point source where the difference in loudness levels is 3 dB is: (log_(10)2=0.3) .

A point source is emitting sound in all directions. The ratio of distance of two points from the point source where the difference in loudness levels is 3 dB is: (log_(10)2=0.3) .

A point source is emitting sound in all directions. The ratio of distance of two points from the point source where the difference in loudness levels is 3 dB is: (log_(10)2=0.3) .