College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Light travels at a speed of about 3 × 103 m/s. (a) How many miles down a pulse of light travel in a time interval of 0.1 s, which is about the blink of an eye? (b) Compare this distance to the diameter of Earth.

(a)

To determine
The distance covered by light in 0.1 s

Explanation

Given info: The speed of light is 3Ã—108â€‰m/s and time is 0.1â€‰s .

Explanation:

The formula to calculate the distance travelled by light is,

Î”x=cÎ”t

Here,

Î”t is the time taken.

Î”x is the distance covered.

c is the speed of light.

Substitute 3Ã—108â€‰m/s for c andÂ  0.1â€‰s for Î”t to find Î”x .

Î”t=(3Ã—108â€‰m/s)(0

(b)

To determine
The comparison between the distance travelled by light in 0.1 s with the diameter of Earth.

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