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Get Full Access to University Physics - 13 Edition - Chapter 17 - Problem 114p
Get Full Access to University Physics - 13 Edition - Chapter 17 - Problem 114p

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# The rate at which radiant energy from the sun reaches the

ISBN: 9780321675460 31

## Solution for problem 114P Chapter 17

University Physics | 13th Edition

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Problem 114P

The rate at which radiant energy from the sun reaches the earth’s upper atmosphere is about 1.50 kW/m2. The distance from the earth to the sun is 1.50 X 1011 m, and the radius of the sun is 6.96 X 108 m. (a) What is the rate of radiation of energy per unit area from the sun’s surface? (b) If the sun radiates as an ideal blackbody, what is the temperature of its surface?

Step-by-Step Solution:

Solution 114P Step 1 : In this question , we need to find rate of radiation energy per unit area from surface of sun’s surface Temperature on surface of sun Data given Rate of radiation dQ = 1.50 kW/m 2 dt 11 Distance from earth to Sun = 1.50 × 10 m Radius of Sun r = 6.96 × 10 m 8 Let us find the area of the Sun’s surface It is given by A = 4 r 2 Substituting the values we get 8 A = 4 × 6.96 × 10 m 18 A = 4 × 1.5218 × 10 m A = 6.0873 × 10 m 18

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