Physical Chemistry

2nd Edition
Ball + 3 others
Publisher: Wadsworth Cengage Learning,
ISBN: 9781133958437



Physical Chemistry

2nd Edition
Ball + 3 others
Publisher: Wadsworth Cengage Learning,
ISBN: 9781133958437
Chapter 9, Problem 9.28E
Textbook Problem

Sunburn is caused by ultraviolet (UV) radiation. Why does red light not cause sunburn?

Interpretation Introduction


The reason as to why red light does not cause sunburn whereas ultraviolet (UV) radiation does.

Concept introduction:

The ultraviolet rays are of two types, UV-A and UV-B. The UV-B is responsible for sunburns which may lead to skin cancer. The Ultraviolet rays are high in energy such that they penetrate into the skin.

Explanation of Solution

In the electromagnetic spectrum, the wavelength of ultraviolet light in the range of 10nm-400nm and red light is and 635

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Chapter 9 Solutions

Physical Chemistry
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Ch. 9 - Explain why no lines in the Balmer series of the...Ch. 9 - What are the series limits see the previous...Ch. 9 - The following are the numbers n2 for some of the...Ch. 9 - The Balmer series is isolated from the other...Ch. 9 - Given that the wavelengths of the first three...Ch. 9 - Some scientists study Rydberg atoms, atoms whose...Ch. 9 - From the numbers determined by Millikan, what was...Ch. 9 - a Using the identities of alpha a helium nucleus...Ch. 9 - a How much radiant energy is given off, in...Ch. 9 - Stefans law, equation 9.18, suggests that any body...Ch. 9 - Pit vipers are a subfamily of venomous snakes with...Ch. 9 - Betelgeuse pronounced beetle juice is a reddish...Ch. 9 - An average human body has a surface area of...Ch. 9 - The surface temperature of our Sun is about 5800K....Ch. 9 - The slope of the plot of energy versus wavelength...Ch. 9 - a Use Wien displacement law to determine the max...Ch. 9 - Human eyes detect color using cells called cones,...Ch. 9 - Sunburn is caused by ultraviolet UV radiation. Why...Ch. 9 - Calculate the energy of photon having: a a...Ch. 9 - The slope of the plot of energy versus wavelength...Ch. 9 - Integrate Plancks law equation 9.23 from the...Ch. 9 - Calculate the power of light in the wavelength...Ch. 9 - Verify that the collection of constants in...Ch. 9 - Work functions are typically given in units of...Ch. 9 - Determine the speed of an electron being emitted...Ch. 9 - Lithium has a work function of 2.90eV. Light...Ch. 9 - If the particle being ejected from the previous...Ch. 9 - Assume that an electron can absorb more than one...Ch. 9 - The photoelectric effect is used today to make...Ch. 9 - Calculate the energy of a single photon in joules...Ch. 9 - The chapter hints that photons have momentum. In...Ch. 9 - Verify that equation 9.34 has units of length.Ch. 9 - Which, if any, of Bohrs postulates about the...Ch. 9 - Show that both sides of equation 9.27 reduce to...Ch. 9 - Use equation 9.34 to determine the radii, in...Ch. 9 - Verify that equation 9.35 yields units of energy.Ch. 9 - Calculate the energies of an electron in the...Ch. 9 - Calculate the angular momenta of an electron in...Ch. 9 - Show that the collection of constants given in...Ch. 9 - Draw a diagram like Figure 9.19 that illustrates...Ch. 9 - Equations 9.33 and 9.34 can be combined and...Ch. 9 - a Compare equations 9.31, 9.34, and 9.41 and...Ch. 9 - Label each of the properties of an electron as a...Ch. 9 - The de Broglie equation for a particle can be...Ch. 9 - What is the wavelength of a baseball having mass...Ch. 9 - Electron microscopes operate on the fact that...Ch. 9 - What velocity must an electron have in order to...Ch. 9 - Plot Plancks law of infinitesimal power flux...Ch. 9 - Determine under what conditions of temperature and...Ch. 9 - Using the second-order differential equation for...Ch. 9 - Construct a table of the first 50 lines of the...

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