Ratan saw a flash of lightning and after sometime heard the sound of thunder. If the time gap between seeing and hearing is 3 s, then write the following steps in sequence to find the height from the ground where the lightning is produced.
(a) Consider the velocity of sound (v) as `330 ms^(-1)`.
(b) Note the time gap (t) between seeing and hearing.
(c) From the formula, speed `= ("distance")/("time taken")`, height at which lightning was produced = speed of sound `xx` time interval.
(d) Substitute the values in the equation (1) and find the value of the height of the lightning from the ground.

Options

A. bacd
B. bcad
C. cbda
D. d a b c

Answer

A

Explanation

From the given data, time gap = 3 s.
We know, v = 330 m `s^(-1)`
Speed `=("distance ")/("time") to C`
Neglecting the time taken by the light to reach the ground because velocity of light is very large, that is,
`C = 3 xx 10^8 m s^(-1)`. On substituting the values, the height of the lightning from the ground is equal to 330 `xx` 3 = 990 m.