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# Electron energy orbit, photoelectric emission, radio waves & light polarization

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PART ONE:
A bright line in the spectrum of an element such as hydrogen is associated with:

A) an electron orbit of low energy

B) an electron orbit of high energy

C) the transfer of an electron from a low energy orbit to a high energy orbit

D) the transfer of an electron from a high energy orbit to a low energy orbit

PART TWO:
In photoelectric emission, the cutoff potential depends on

A) the frequency of the incident light

B) the intensity of the incident light

C) the kinetic energy of the incident light

PART THREE:
Radio waves have very long wave lengths. They are:

A) diffracted less than visible light

B) diffracted more than visible light

C) diffracted the same as visible light

D) not diffracted at all

PART FOUR:
In polarization-analyzer pair, the analyzer

A) produces polarized light

B) transmits polarized light

C) absorbs polarized light

D) may transmit or absorb polarized light

PART FIVE:
A beam of white light travels through a medium containing suspended particles that have diameters smaller than the mean wavelength of visible light. When observed at right angles to its path, the color of the beam is:

A) white

B) red-orange

C) yellow

D) blue

#### Solution Preview

Rather than giving you the answers explicitly, I'm going to give you some background information/preliminary reasoning for each question that should allow you to pick the correct answers without any difficulty.

> PART ONE:
> A bright line in the spectrum of an element such as hydrogen is
> associated with:

Think of how a "line" in a spectrum comes about in terms of the atomic physics. An atom has a number of orbitals, and in the lowest one, the ground state, the electron has the lowest amount of energy. At each progressively higher orbital, the electron has more energy. What would happen if the electron were to fall from a high orbital into a lower one? Well, the electron would go from being in a place (a "state") where it had a high amount of energy to one with a lower amount of energy. Since energy must be conserved, this difference has to be accounted for by the release or absorption of light (depending on which way the electron moves).

So, knowing ...

#### Solution Summary

In a 687 word solution, the answers are detailed and very clear in explanation of the problems.

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