Home
Class 12
PHYSICS
A jet plane flies at an altitude of 1 km...

A jet plane flies at an altitude of 1 km at a speed twice that of sound. How far away will the plane be from an observer when he first hears it coming? 

Text Solution

Verified by Experts

The correct Answer is:
2km
It is evident from Fig. `d = h/(sin alpha) = Mh` where M is the Mach number. 
Promotional Banner

Similar Questions

Explore conceptually related problems

A man fires a shot and hears an echo from a cliff after 2 s . He walks 85 m towards the cliff and the echo of a second shot is now heard after 1.4 s . What is the velocity of sound and how far was the man from the cliff when he first heard the echo ?

A jet plane files horizonally at a height h at a speed v. An anti-aircraft gun fires a shell at the plane when it is vertically above the gun. Show that the minimum muzzle speed required to hit the plane is sqrt(v^(2)+2gh) at an angle tan^(-1)sqrt(2gh)/(v)

A jet plane flies through air with a velocity of 2 Mach. While the velocity of sound is 332 mis, the air speed of the plane is

An aeroplane at an altitude of 1 km flying horizontally at 800 km/hr passes directly over an observer. Find the rate at which it is approaching the observer when it is 1250 metres away from him.

A bullet travels horizontally at 660 m"/"s at a height of 5 m from a man. How far is the bullet from the man when he hears its whistle ? Velocity of sound in air = 340 m"/"s .

An enemy plane is flying horizontally at an altitude of 2km with a speed of 300 ms^(-1) .An army man with an anti-aircraft gun on the ground sights enemy plane when it is directly overhead and fires a shell with a muzzle speed of 600ms^(-1) .At what angle with the vertical should the gun be fired so as to hit the plane?

A boy moves away from a steady source of sound at a constant speed the sound he hears will