21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 42QP
(a)
To determine
The temperature, peak wavelength.
(b)
To determine
The power radiated.
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For the purpose of this exercise, we consider the Earth as a blackbody at a temperature of 300K.
a. Assuming that it is spherical with a radius equals to 6370 km, calculate the total amount energy emitted by the Earth (Hint: The total amount of energy emitted by a surface = amount of energy emitted per unit area x area of the surface).
b. What wavelength range would you recommend to measure radiation emitted by the Earth using a satellite mounted sensor?
1. A carpenter builds an exterior house wall made of wood 3.0 cm thick. The wood has k = 0.080
W/mk. The interior temperature is 19°C and the exterior surface temperature is 9°C. What is the
rate of heat flow per square meter through this wall?
2. What is the wavelength for the energy maximum of blackbody radiation at 30,000°F?
This is an infrared thermometer image of a house at night. It can be used
to find heat leak in a house.
61
L
https://www.digitaltrends.com/home/use-infrared-thermometer-easily-spot-heat-leaks-house/
a. The bright parts are higher temperature than the dark regions.
b. The bright parts indicate the emitted E-M radiation with longer
wavelength.
c. The bright parts indicate high intensity of E-M radiation.
d. The bright parts indicate the emitted E-M radiation with high
frequency.
e. The brightness of image doesn't mean anything.
Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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