CEM 141 MSU Exam 2 Questions & Answers | 100% Verified solutions
|Questions with Correct Answers 2025 latest update!!
1. Lights acts as what? Particle and wave.
2. Wavelength The distance (m) of waves
from peak to peak. Short: x-ray
(red), long: infrared (blue)
Short - higher energy
Long - lower energy
3. Frequency (V) The number of wavefronts per
second. Highest: x-ray
4. Velocity of Light C = 3.00 X 10^8
= wavelength X frequency
5. Amplitude The intensity, height of peaks
of waves. Highest: blue light
6. Energy of Wave (J) Increases as frequency in-
creases and as wavelength de-
creases. Highest: x-ray
7. Range of Wavelengths 10^-16 - 10^8 = 24. Only a
third are visible
8. Black Body Radiation When a mass is heated it emits
a type of EM radiation, at very
high temps the mass becomes
"white hot" because all wave-
lengths of visible light become
equally intense
9. Photoelectric Effect Metals emit electrons
when electromagnetic radia-
, CEM 141 MSU Exam 2 Questions & Answers | 100% Verified solutions
|Questions with Correct Answers 2025 latest update!!
tion shines on the surface,
light is transfers energy to the
electrons at the metal's sur-
face where it's transformed
into KE that gives the electrons
enough energy to leave the
atom
Depends on frequency not in-
tensity
10. How many electrons are emitted if the light is be- None.
low it's threshold frequency no matter the intensi-
ty?
11. What increases the number of electrons to be emit- Intensity.
ted by the photoelectric effect?
12. A particle that transfers light energy with a defin- Photon.
able energy, emits one electron
energy of = h (6.626 x 10^-34 J)
13. Energy of light equation? E = hV.
14. h Planck's constant, the energy
of a photon.
15. What happens to the energy when there is a short High energy.
wavelength?
16. Light from the sun (white light) can be separated by Visible Spectrum.
a prism to create this, only a small part of the full
EM spectrum?
, CEM 141 MSU Exam 2 Questions & Answers | 100% Verified solutions
|Questions with Correct Answers 2025 latest update!!
17. Atomic Emission Spectrum Spectrum that emits photons,
energy diagram: electron goes
down energy levels.
18. Atomic Absorption Spectrum Spectrum that absorbs pho-
tons, energy diagram: elec-
trons goes up in energy levels.
19. Heisenberg Uncertainty Principle 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.
20. Schrodinger's Wave Equation Treated electron as waves de-
rived by mathematical descrip-
tions of energies.
Psi = wave function of an elec-
tron
|Questions with Correct Answers 2025 latest update!!
1. Lights acts as what? Particle and wave.
2. Wavelength The distance (m) of waves
from peak to peak. Short: x-ray
(red), long: infrared (blue)
Short - higher energy
Long - lower energy
3. Frequency (V) The number of wavefronts per
second. Highest: x-ray
4. Velocity of Light C = 3.00 X 10^8
= wavelength X frequency
5. Amplitude The intensity, height of peaks
of waves. Highest: blue light
6. Energy of Wave (J) Increases as frequency in-
creases and as wavelength de-
creases. Highest: x-ray
7. Range of Wavelengths 10^-16 - 10^8 = 24. Only a
third are visible
8. Black Body Radiation When a mass is heated it emits
a type of EM radiation, at very
high temps the mass becomes
"white hot" because all wave-
lengths of visible light become
equally intense
9. Photoelectric Effect Metals emit electrons
when electromagnetic radia-
, CEM 141 MSU Exam 2 Questions & Answers | 100% Verified solutions
|Questions with Correct Answers 2025 latest update!!
tion shines on the surface,
light is transfers energy to the
electrons at the metal's sur-
face where it's transformed
into KE that gives the electrons
enough energy to leave the
atom
Depends on frequency not in-
tensity
10. How many electrons are emitted if the light is be- None.
low it's threshold frequency no matter the intensi-
ty?
11. What increases the number of electrons to be emit- Intensity.
ted by the photoelectric effect?
12. A particle that transfers light energy with a defin- Photon.
able energy, emits one electron
energy of = h (6.626 x 10^-34 J)
13. Energy of light equation? E = hV.
14. h Planck's constant, the energy
of a photon.
15. What happens to the energy when there is a short High energy.
wavelength?
16. Light from the sun (white light) can be separated by Visible Spectrum.
a prism to create this, only a small part of the full
EM spectrum?
, CEM 141 MSU Exam 2 Questions & Answers | 100% Verified solutions
|Questions with Correct Answers 2025 latest update!!
17. Atomic Emission Spectrum Spectrum that emits photons,
energy diagram: electron goes
down energy levels.
18. Atomic Absorption Spectrum Spectrum that absorbs pho-
tons, energy diagram: elec-
trons goes up in energy levels.
19. Heisenberg Uncertainty Principle 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.
20. Schrodinger's Wave Equation Treated electron as waves de-
rived by mathematical descrip-
tions of energies.
Psi = wave function of an elec-
tron
