CEM 141 MSU UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● Wavelength
Answer: The distance (m) of waves from peak to peak. Short: x-ray
(red), long: infrared (blue)
Short - higher energy
Long - lower energy
●● Frequency (V)
Answer: The number of wavefronts per second. Highest: x-ray
●● Velocity of Light
Answer: C = 3.00 X 10^8
= wavelength X frequency
●● Amplitude
Answer: The intensity, height of peaks of waves. Highest: blue light
●● Energy of Wave (J)
,Answer: Increases as frequency increases and as wavelength decreases.
Highest: x-ray
●● Range of Wavelengths
Answer: 10^-16 - 10^8 = 24. Only a third are visible
●● Black Body Radiation
Answer: 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
Answer: 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?
Answer: None.
●● What increases the number of electrons to be emitted by the
photoelectric effect?
, Answer: Intensity.
●● A particle that transfers light energy with a definable energy, emits
one electron
energy of = h (6.626 x 10^-34 J)
Answer: Photon.
●● Energy of light equation?
Answer: E = hV.
●● h
Answer: Planck's constant, the energy of a photon.
●● What happens to the energy when there is a short wavelength?
Answer: 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?
Answer: Visible Spectrum.
●● Atomic Emission Spectrum
Answer: Spectrum that emits photons, energy diagram: electron goes
down energy levels.
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● Wavelength
Answer: The distance (m) of waves from peak to peak. Short: x-ray
(red), long: infrared (blue)
Short - higher energy
Long - lower energy
●● Frequency (V)
Answer: The number of wavefronts per second. Highest: x-ray
●● Velocity of Light
Answer: C = 3.00 X 10^8
= wavelength X frequency
●● Amplitude
Answer: The intensity, height of peaks of waves. Highest: blue light
●● Energy of Wave (J)
,Answer: Increases as frequency increases and as wavelength decreases.
Highest: x-ray
●● Range of Wavelengths
Answer: 10^-16 - 10^8 = 24. Only a third are visible
●● Black Body Radiation
Answer: 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
Answer: 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?
Answer: None.
●● What increases the number of electrons to be emitted by the
photoelectric effect?
, Answer: Intensity.
●● A particle that transfers light energy with a definable energy, emits
one electron
energy of = h (6.626 x 10^-34 J)
Answer: Photon.
●● Energy of light equation?
Answer: E = hV.
●● h
Answer: Planck's constant, the energy of a photon.
●● What happens to the energy when there is a short wavelength?
Answer: 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?
Answer: Visible Spectrum.
●● Atomic Emission Spectrum
Answer: Spectrum that emits photons, energy diagram: electron goes
down energy levels.
