Noise intensity of jet aeroplane is

Noise is

Noise is

Pollutant of jet planes is:

Which physical principal is involved in the working of a jet aeroplane ?

A person standing on an open ground hears the sound of a jet aeroplane , coming from north at an angle 60^(@) with ground level ,But he finds the aeroplane right vertically above his position , if V is the speed of sound , speed of the plane is :

A person standing on an open ground hears the sound of a jet aeroplane , coming from north at an angle 60^(@) with ground level ,But he finds the aeroplane right vertically above his position , if V is the speed of sound , speed of the plane is :

Assertion : Inhabitants close to busy airports are likely to experience helth hazards. Reason : Sound levels of jet aeroplanes usually excessd 160 dB.

Noise cause