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Conceptual Physics | 11th Edition | ISBN: 9780321568090 | Authors: Paul G. Hewitt
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Answer: A rule of thumb for estimating the distance in

Chapter 20, Problem 30E

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QUESTION:

Problem  30E

A rule of thumb for estimating the distance in kilometers between an observer and a lightning stroke is to divide the number of seconds in the interval between the flash and the sound by 3. Is this rule correct? Defend your answer.

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QUESTION:

Problem  30E

A rule of thumb for estimating the distance in kilometers between an observer and a lightning stroke is to divide the number of seconds in the interval between the flash and the sound by 3. Is this rule correct? Defend your answer.

ANSWER:

Solution 30E

Step 1 of 2:

The speed of sound in air is about 333 m/s, whereas the speed of light is 3 million m/s (m/s). Which means , for most of  the practical cases, the speed of light is instantaneous.

Therefore, we see the flash at the same instant when it happens, whereas the sound travels at 333m/s , we hear the sound later. To travel 1 kilometer, sound takes 3 seconds,

Therefore, the approximate rule (3 seconds per kilometer) is correct.

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