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
Solve in copy.
for 7.5 points.
Answers
Answered by
7
Answer: (B) 4 sec
Explanation:
Given that,
Speed v= 50 m/s
Speed of sound = 300 m/s
Distance D= 0.7 km
We know that,
Hence, the time taken for the driver to hear its echo is 4 sec.
So, The correct option is (B).
Answered by
2
Answer:
Explanation:
Given that,
Speed v= 50 m/s
Speed of sound = 300 m/s
Distance D= 0.7 km
We know that,
t = \dfrac{2D}{v_{c} +v_{s}}
t = \dfrac{1.4\times10^{3}\ m}{(50+300)\ m/s}
t = 4\ sec
Hence, the time taken for the driver to hear its echo is 4 sec.
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