CEM 141 MSU Exam 2
MSU CEM 141 REAL EXAM LATEST 2026-2027 FINAL
EXAM WITH QUESTIONS AND CORRECT DETAILED
CORRECT ANSWERS ALREADY GRADED A+
Lights acts as what? - __100% correct answer as Particle
and wave.
Wavelength - __100% correct answer as The distance (m)
of waves from peak to peak. Short: x-ray (red), long:
infrared (blue)
Short - higher energy
Long - lower energy
Frequency (V) - __100% correct answer as The number of
wavefronts per second. Highest: x-ray
Velocity of Light - __100% correct answer as C = 3.00 X
10^8
= wavelength X frequency
Amplitude - __100% correct answer as The intensity,
height of peaks of waves. Highest: blue light
,Energy of Wave (J) - __100% correct answer as Increases
as frequency increases and as wavelength decreases.
Highest: x-ray
Range of Wavelengths - __100% correct answer as 10^-
16 - 10^8 = 24. Only a third are visible
Black Body Radiation - __100% correct answer as 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
Photoelectric Effect - __100% correct answer as 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
How many electrons are emitted if the light is below it's
threshold frequency no matter the intensity? - __100%
correct answer as None.
What increases the number of electrons to be emitted by
the photoelectric effect? - __100% correct answer as
Intensity.
A particle that transfers light energy with a definable
energy, emits one electron
energy of = h (6.626 x 10^-34 J) - __100% correct answer
as Photon.
, Energy of light equation? - __100% correct answer as E =
hV.
h - __100% correct answer as Planck's constant, the
energy of a photon.
What happens to the energy when there is a short
wavelength? - __100% correct answer as High energy.
Light from the sun (white light) can be separated by a
prism to create this, only a small part of the full EM
spectrum? - __100% correct answer as Visible Spectrum.
Atomic Emission Spectrum - __100% correct answer as
Spectrum that emits photons, energy diagram: electron
goes down energy levels.
Atomic Absorption Spectrum - __100% correct answer as
Spectrum that absorbs photons, energy diagram:
electrons goes up in energy levels.
Heisenberg Uncertainty Principle - __100% correct answer
as 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.
Schrodinger's Wave Equation - __100% correct answer as
Treated electron as waves derived by mathematical
descriptions of energies.
Psi = wave function of an electron
MSU CEM 141 REAL EXAM LATEST 2026-2027 FINAL
EXAM WITH QUESTIONS AND CORRECT DETAILED
CORRECT ANSWERS ALREADY GRADED A+
Lights acts as what? - __100% correct answer as Particle
and wave.
Wavelength - __100% correct answer as The distance (m)
of waves from peak to peak. Short: x-ray (red), long:
infrared (blue)
Short - higher energy
Long - lower energy
Frequency (V) - __100% correct answer as The number of
wavefronts per second. Highest: x-ray
Velocity of Light - __100% correct answer as C = 3.00 X
10^8
= wavelength X frequency
Amplitude - __100% correct answer as The intensity,
height of peaks of waves. Highest: blue light
,Energy of Wave (J) - __100% correct answer as Increases
as frequency increases and as wavelength decreases.
Highest: x-ray
Range of Wavelengths - __100% correct answer as 10^-
16 - 10^8 = 24. Only a third are visible
Black Body Radiation - __100% correct answer as 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
Photoelectric Effect - __100% correct answer as 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
How many electrons are emitted if the light is below it's
threshold frequency no matter the intensity? - __100%
correct answer as None.
What increases the number of electrons to be emitted by
the photoelectric effect? - __100% correct answer as
Intensity.
A particle that transfers light energy with a definable
energy, emits one electron
energy of = h (6.626 x 10^-34 J) - __100% correct answer
as Photon.
, Energy of light equation? - __100% correct answer as E =
hV.
h - __100% correct answer as Planck's constant, the
energy of a photon.
What happens to the energy when there is a short
wavelength? - __100% correct answer as High energy.
Light from the sun (white light) can be separated by a
prism to create this, only a small part of the full EM
spectrum? - __100% correct answer as Visible Spectrum.
Atomic Emission Spectrum - __100% correct answer as
Spectrum that emits photons, energy diagram: electron
goes down energy levels.
Atomic Absorption Spectrum - __100% correct answer as
Spectrum that absorbs photons, energy diagram:
electrons goes up in energy levels.
Heisenberg Uncertainty Principle - __100% correct answer
as 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.
Schrodinger's Wave Equation - __100% correct answer as
Treated electron as waves derived by mathematical
descriptions of energies.
Psi = wave function of an electron
