Chapter 7: Atoms

WAVE-PARTICLE DUALITY
LIGHT Is a wave ... Is a particle ... phenomenon?
Reflection
Reflection
...
Refraction
Refraction?
...
Interference
??
...
Polarization
XX
...
Diffraction
XX
Rayleigh criteria
XX
Photo-electric
...

Describe the photoelectric effect. How does it indicate that light is composed of particles?

What aspects of the photoelectric effect experiment were surprising to the classical physicists of the day?

What is "blackbody radiation"? How does the "particle" view of light help explain it?

The failure of classical physics to explain blackbody radiation is called the "ultraviolet catastrophe". Explain the implications of this phrase.

What is a quantum of light called and what is the relationship which characterizes it?

How do you determine the temperature of a hot object using the blackbody radiation curve?

Is light composed of particles or waves?

Atomic electrons have specific allowed energy states. Why?

If atoms occupy only certain allowed levels, how do they get from one allowed level to another?

Why do atoms emit or absorb only certain specific colors of light?

How can you tell that there is calcium in the atmosphere of the star Betelgeuse, which is about 310 light years away from the earth?

Why is it that you are transparent to radio waves, more and more opaque as the frequency increases to the visible and ultraviolet part of the spectrum, and then suddenly transparent again when you get to the xray part of the electromagnetic spectrum?

Why do you say that ultraviolet exposure might involve some risk of skin cancer, whereas exposure from your microwave oven carries no such risk?

What types of radiation make up the ionizing radiation which we might be exposed to?

What is a laser?

What are the characteristic properties which make the light from a laser unique?

What is a hologram? What properties distinguish a hologram from an ordinary photograph?

*Wave particle duality

*Rayleigh criterion

*Photoelectric effect

*Blackbody radiation

*Rayleigh-Jeans law

*Failures of classical physics

*Quantized energies

*Wien displacement law

*Red hot object

*Star colors

*IRAS satellite

*3K background

*Wave-particle duality

*Photoelectric effect

*Bohr model

*Absorption and emission

*Stimulated emission

*Planck hypothesis

*Hydrogen spectrum

*Radiation effects

*Absorption of radiation

*UV interactions

*Quantum energies

*Electromagnetic spectrum

*Laser

*Laser properties

*Hologram

*Properties of holograms

Index
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