Question

When sound is produced in an aeroplane moving with a
velocity of 200 m s'horizontally, its echo is heard after
10 15 seconds. If velocity of sound in air is 300 m s!
then the elevation of aircraft is
A. 250 m
B. 250 V5 m
C. 1250 m
D. 2500 m​

Answer 1

The correct option is D

2500 m

Explanation:

As the time given for eco is = 10√5 s

and velocity of the plane is given as = 200 m/s

so

200 x 5√5 = 2236 m

Now

300 x 5√5 =3354m

so

2500 is the elevation of the plane

Learn more about velocity here:

What is the definition of velocity

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