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CEM 141 MSU Exam 2 Questions & 100% Verified Correct Answers with complete solutions (Latest update

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CEM 141 MSU Exam 2 Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
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  • 2024/2025
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CEM 141 MSU Exam 2
Particle and wave. - ANS-Lights acts as what?

The distance (m) of waves from peak to peak. Short: x-ray (red), long: infrared (blue)
Short - higher energy
Long - lower energy - ANS-Wavelength

The number of wavefronts per second. Highest: x-ray - ANS-Frequency (V)

C = 3.00 X 10^8
= wavelength X frequency - ANS-Velocity of Light

The intensity, height of peaks of waves. Highest: blue light - ANS-Amplitude

Increases as frequency increases and as wavelength decreases. Highest: x-ray - ANS-Energy
of Wave (J)

10^-16 - 10^8 = 24. Only a third are visible - ANS-Range of Wavelengths

When a mass is heated it emits a type of EM radiation, at very high temps the mass becomes
"white hot" because all wavelengths of visible light become equally intense - ANS-Black Body
Radiation

Metals emit electrons when electromagnetic radiation shines on the surface, light is transfers
energy to the electrons at the metal's surface where it's transformed into KE that gives the
electrons enough energy to leave the atom
Depends on frequency not intensity - ANS-Photoelectric Effect

None. - ANS-How many electrons are emitted if the light is below it's threshold frequency no
matter the intensity?

Intensity. - ANS-What increases the number of electrons to be emitted by the photoelectric
effect?

Photon. - ANS-A particle that transfers light energy with a definable energy, emits one electron
energy of = h (6.626 x 10^-34 J)

E = hV. - ANS-Energy of light equation?

Planck's constant, the energy of a photon. - ANS-h

, High energy. - ANS-What happens to the energy when there is a short wavelength?

Visible Spectrum. - ANS-Light from the sun (white light) can be separated by a prism to create
this, only a small part of the full EM spectrum?

Spectrum that emits photons, energy diagram: electron goes down energy levels. - ANS-Atomic
Emission Spectrum

Spectrum that absorbs photons, energy diagram: electrons goes up in energy levels. -
ANS-Atomic Absorption Spectrum

Principle states that we can't accurately measure both the position and the energy of a small
particle (electron)
Bohr's model did - why its wrong. - ANS-Heisenberg Uncertainty Principle

Treated electron as waves derived by mathematical descriptions of energies.
Psi = wave function of an electron
Psi^2 = probability of finding an electron. - ANS-Schrodinger's Wave Equation

Regions of space where electrons with a particular quantized energy have a high probability of
being found, described by quantum numbers. - ANS-Atomic Orbitals

n, l, ml, and ms. - ANS-What are the quantum numbers?

Determines the energy of the electron and identifies its shell. - ANS-What does quantum
number "n" mean?

Identifies the type of orbital (s,p,d) and subshell
= 0 - n-1. - ANS-What does quantum number "l" mean?

Specifies a particular orbital within a subshell
= -l - +l (2l + 1 possible values)
tells us how many s,p,d orbitals are found in each sub shell. - ANS-What does quantum number
"ml" mean?

Describes the spin of the electron in each orbital
= +1/2 or -1/2
(only 2 e- in each orbital, each one has either + spin or - spin). - ANS-What does quantum
number "ms" mean?

Principle that electrons occupy the lowest level orbitals first. - ANS-Aufbau Principle

Rule that electrons occupy orbitals of the same energy singly until they have to pair up. -
ANS-Hund's Rule

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