Subject :NSO Class : Class 8
A car travelling normally towards a cliff at a speed
of 50 m s–1, sounds its horn when it is 0.7 km
away. Taking the speed of sound to be 300 m s–1 in
air, find the time taken for the driver to hear its echo.
A 0.04 s
B 4.0 s
C 4.7 s
D 28.0 s
Ans 1:
Class : Class 8