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Q.

Is it true that the gun is fired from a distance, then an observer sees the flash of the firing of a gun a bit earlier and listens to the sound of fire later?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is True.
At room temperature, the speed of sound in the air is 330 m/s. It is even slower than the speed of light, so we can disregard it when compared to the speed of light. We know that the speed of light in free space is three million kilometres per second. When we look at a gunshot from a distance, the flash of a gun travels at the speed of light, which is 3,00,000 km/s, and it takes no time at all to reach our eye, even if we are thousands of kilometres away.
On the other hand, the sound of a gunshot travels through the air at 330 m/s, meaning it takes about 3 seconds to cover a 1 km distance. The time delay of 3 seconds is easily noticeable, and thus we see the flash of the gunshot before hearing the sound of the gunshot.
 
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