   Chapter 14, Problem 1P

Chapter
Section
Textbook Problem

Suppose you hear a clap of thunder 16.2 s after seeing the associated lightning stroke. The speed of light in air is 3.00 × 108 m/s. (a) How far are you from the lightning stroke? (b) Do you need to know the value of the speed of light to answer? Explain.

(a)

To determine
The distance away from the lightning stroke.

Explanation

Given info: Time taken to hear a clap of thunder is 16.2 s and the speed of sound is 343m/s

Formula for distance travelled by the thunder is,

d=vt

• v is the speed of the sound
• t  is the time taken to hear the clap of a thunder.

Substitute 16.2 s for t and 343m/s for v in the above expression to get d

(b)

To determine
Whether it is necessary to know the value of speed of light to answer.

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