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Q.

During thunderstorms lightning is seen first and thunder is heard later on. Why?


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a

First light and then sound is produced

b

Light travels faster than sound

c

Sound travels faster than light

d

Sound becomes feeble due to strom 

answer is B.

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Detailed Solution

Concept: As we all know, the development of thunderstorms depends on the presence of both moisture and instability in rising air. For thunderstorms to arise, the air density should be lower. The surface of the air heats the air and decreases its density.
The hot air surrounding a thunderbolt doesn't have time to expand as it travels from the clouds to the ground. The pressure of the hot air rapidly decreases. The prior hot air was compressed from ten to one hundred times the actual atmospheric pressure as the air cooled. As a result, the air abruptly explodes, releasing a shock wave with a high intensity that humans can hear as a high pitch sound.
Light travels faster than sound, so during a thunderstorm, lightning is first seen and then thunder is heard. Thunder always precedes lightning. If a lightning strike is visible but no thunder can be heard, the thunderstorm is probably quite a distance away. The sound of the thunder must have been redirected upward. The more the sound is reflected away from the ground, the further it will travel.
The sound of the thunder is heard considerably later after the light bolt because the speed of light is far higher than the speed of sound.
Hence, the correct option is 2.
 
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