child hears an echo from a cliff, 4 second after the
werful cracker is produced. How far away is the
ild? (velocity of sound in air is 330 m/s].
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Answer: 330×4÷2=660m
Explanation:
The velocity of sound can be calculated by the formula : v=2d÷t. Here,
v is the velocity of sound (here it is 330)
d is the distance travelled by the sound(as the sound is an echo,we should use 2×distance)
t is the time interval between the instance of production of sound and receiving of sound(here it is 4 second)
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