# how long it takes for a light ray from sum to reach the earth.

### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

#### Solutions

Chapter 1.2, Problem 96E
To determine

## To find: how long it takes for a light ray from sum to reach the earth.

Expert Solution

The time for a light ray from the sun to reach the earth

500sec .

### Explanation of Solution

Given information:

The speed of light is about 186000 mi/s.

Concept used:

Scientific notation:

A notation in which a given quantity can be expressed as a number with significant digits required for a specified degree of accuracy and multiplied by 10 to the appropriate power.

Calculation:

The distance from the earth to sun is about 93 million miles = 93000000 miles

The speed of light is about 186000 mi/s

Now, we find the time for a light ray from the sun to reach the earth

Time=distancespeed=93000000186000=500sec

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