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Chapter 4: Q19E (page 1074)

A space probe2.0脳1010m from a star measures the total intensity of electromagnetic radiation from the star to be 5.0脳103W/m2. If the starradiates uniformly in all directions, what is its total average power output?

Short Answer

Expert verified

The total average power output is 2.5脳1025W.

Step by step solution

01

Define the intensity ( I ).

The power transported per unit area is known as the intensity( I) .

The formula used to calculate the intensity( I) is:

I=PA

Where, A is area measured in the direction perpendicular to the energy and P is the power in watts.

02

given values

Given that,

r=2脳1010mI=5.0脳103W/m2

03

calculation

Consider the path of the source to be a sphere.

Now, the average power output is

P=IA=5.0脳1034蟺2脳1010=5.0脳1035.02脳1021=2.5脳1025W

Hence, the average power output is equal to data-custom-editor="chemistry" 2.5脳1025W.

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