Exercises for Weather & Climate (9th Edition)
Exercises for Weather & Climate (9th Edition)
9th Edition
ISBN: 9780134041360
Author: Greg Carbone
Publisher: PEARSON
Question
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Chapter 3, Problem 1E

a)

Expert Solution
Check Mark
To determine

The amount of radiation emitted from the surface of the Sun, given the average surface temperature of Sun is 6000 K.

Answer to Problem 1E

The radiation emitted by the Sun at 6000K is 73,483,200Wm2.

Explanation of Solution

Electromagnetic energy is radiated from the Sun, and it reaches the surface of the Earth in the form of visible radiations. Initially, the spectrum contains all types of wavelengths, and the atmosphere filters out certain wavelengths.

The emission of radiation by a body can be understood from Stefan–Boltzmann law. This law states, “Energy emitted by a body is directly proportional to the fourth power of temperature”.

ET4E=σT4

Here, E is the energy emitted by a body, T is the temperature of the body, and σ is the Stefan–Boltzmann constant

The formula to calculate the radiation emitted by the Sun at 6,000K is expressed below:

E=σT4

Substitute 5.67×108Wm2K4 for σ and 6000 K for T to find the radiation emitted by the Sun at 6,000K.

E=(5.67×108Wm2K4)(6,000K)4=73,483,200Wm2

Therefore, the radiation emitted by the Sun at 6000K is 73,483,200Wm2.

b)

Expert Solution
Check Mark
To determine

The amount of radiation emitted from the Earth’s surface at 300 K.

Answer to Problem 1E

The radiation emitted by the Earth’s surface at 300K is 459.27Wm2.

Explanation of Solution

Refer to subpart ‘a’ for description regarding Stefan–Boltzmann law.

The formula to calculate the radiation emitted by the Earth’s surface at 300K is expressed below:

E=σT4

To find the radiation emitted by the Earth’s surface at 300K, substitute 5.67×108Wm2K4 for σ and 300 K for T.

E=(5.67×108Wm2K4)(3,00K)4=459.27Wm2

Therefore, the radiation emitted by the Earth’s surface at 300K is 459.27Wm2.

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