Home
Class 9
PHYSICS
Explain why there is usually a time inte...

Explain why there is usually a time interval between observing a flash of lighning and hearing its thunder. Account for the rolling sound which is often produced when the thunder is heard.

Text Solution

Verified by Experts

Since light travels much faster than sound, flash of lightning is seen first and the thunder is heard later on. The rolling sound of thunder is due to successive reflections from a number of number of reflecting surfaces such as clouds, mountains, rocks and various layers of air of different densities.
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

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.

Statement-1 : The flash of lightening is seen before the sound of thunder is heard Statement-2 : The sound of thunder is produced after the flash of lightening.

Explain why, the flash of lightning reached us first and the sound of thunder is heard a little later.

A divalent bluish-white metal which occus in nature as its sulphide ore reacts with a dilute solution of HCI to produce a gas. The gas burns with a pop sound. This gas is also produced when the metal is warmed with concentrated solution of NaOH. (i) Identify the metal. (ii) Wite the equations for the reactions involved. Explain the use of the metal in the galvanization of iron articless.