A) 1 second after seeing the flash
B) 2 seconds after hearing the gun
C) 2 seconds after seeing the flash
D) 4 seconds after hearing the gun.
Correct Answer: C
Solution :
Echo will be heard when the sound of the gun gets reflected from the cliff, Thus the total distance travelled by the sound of gun,\[S={{x}_{1}}+{{x}_{2}}+{{x}_{3}}\] = 150+150+300 =600 m \[v\text{ }=\text{ }300\text{ }m\text{ }{{s}^{-1}}\] \[\therefore t=\frac{S}{v}=\frac{600}{300}=2s\]You need to login to perform this action.
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