Explanation Introduction: Any object which is above the absolute zero temperature emits radiation and simultaneously absorbs radiation, when it comes in contact with sunlight. The portion of the object on which light directly falls gives visible spectrum of light and the other side which is not in direct contact with the light gives dark lines on the visible spectrum. When an object absorbs more energy from sunlight that falls on it,that it emits simultaneously it comes in visible spectrum of light and part of object that absorbs more energy in comparison to light which it emits comes in dark portion of visible spectrum...

OER 2016 Edition

ISBN: 9781947172173

Author: OpenStax

Publisher: OpenStax College

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Blackbody

Q.5 A blackbody radiates how much energy when the temperature of the body is elevated?

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Chapter 29, Problem 1TP

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The Reason for dark lines in the visible spectrum of sunlight when it passes through a cool gas compared to the surface of the sun.

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Chapter 29, Problem 86PE

Chapter 29, Problem 2TP

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The visible spectrum of sunlight shows a range of colors from red to violet. This spectrum has numerous dark lines spread throughout it. Noting that the surface of the Sun is much cooler than the interior, so that the surface is comparable to a cool gas through which light passes, which a. The cooler, denser surface material scatters certain wavelengths of light, forming dark lines. b. The atoms at the surface absorb certain wavelengths of light, causing the dark lines at those wavelengths. c. The atoms in the Sun’s interior emit light of specific wavelength, so that parts of the spectrum are dark. d. The atoms at the surface are excited by the high interior temperatures, so that the dark lines are merely wavelengths at which those atoms don’t emit energy.

Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K? a. There is no hydrogen in stars this hot. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.

Suppose YOUR body temperature averages 98.6 F. 1. How much radiant energy in Wm^-2 is emitted from YOUR body? 2. What is the total radiant energy in W that is emitted from YOUR body? 3. At what wavelength does YOUR body emit the largest amount of radiant energy?

Chapter 29 Solutions

College Physics

Ch. 29 - Give an example of a physical entity that is...Ch. 29 - Give an example of a physical entity that is not...Ch. 29 - What aspect of the blackbody spectrum forced...Ch. 29 - If Planck's constant were large, say 1034 times...Ch. 29 - Why don't we notice quantization in everyday...Ch. 29 - Is visible light the only type of EM radiation...Ch. 29 - Which aspects of the photoelectric effect cannot...Ch. 29 - Is the photoelectric effect a direct consequence...Ch. 29 - Insulators (nonmetals) have a higher BE than...Ch. 29 - If you pick up and shake a piece of metal that has...

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The Reason for dark lines in the visible spectrum of sunlight when it passes through a cool gas compared to the surface of the sun.

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The Reason for dark lines in the visible spectrum of sunlight when it passes through a cool gas compared to the surface of the sun.

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