To find: how long it takes for a light ray from sum to reach the earth.
The time for a light ray from the sun to reach the earth
The speed of light is about 186000 mi/s.
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.
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
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