Homework 8

Question 1

Define every value on equation 21.2

Answer 1

v=frequency, c= speed of liight, & gamma=wavelength

Question 2

Distinguish among materials that are opaque, translucent, and transparent in terms of
their appearance and light transmittance

Answer 2

Opaque materials are impervious to light transmission; it is not possible to see through
them.

Light is transmitted diffusely through translucent materials (there is some internal light
scattering). Objects are not clearly distinguishable when viewed through a translucent material.

Virtually all of the incident light is transmitted through transparent materials, and one can
see clearly through them.

Question 3

Briefly explain why metals are opaque to electromagnetic radiation having photon
energies within the visible region of the spectrum.

Answer 3

The light energy is totally absorbed or reflected, and, since none is
transmitted, the material is opaque

Question 4

maximum wavelength for visible light, gamma(max)

Answer 4

0.7 µm

Question 5

µ conversion

Answer 5

10^-6

Question 6

How do you determine percentage composition?

Answer 6

(100%-E_g)/(100%-0%)=(Max eV-Calculated eV)/(Max eV-MineV)

Question 7

what determines the characteristic color of a metal

Answer 7

determined by the distribution of wavelengths of

the nonabsorbed light radiation that is reflected

Question 8

what determines the characteristic color of transparent nonmetal.

Answer 8

the distribution of

wavelengths of the nonabsorbed light radiation that is transmitted through the material