CEM 141 MSU EXAM SCRIPT VERIFIED
QUESTIONS WITH ACCURATE ANSWERS
●● Wavelength =
Answer: Distance from peak to peak.
●● Frequency =
Answer: Number of wavelengths per sec.
●● Amplitude
Answer: Height of a wave.
●● Energy increases as =
Answer: Frequency increases and wavelength decreases.
●● Photoelectric Effect
Answer: The emission of electrons from a metal when light shines on
the metal.
●● Why does adding energy in the form of light (EM radiation) allow
electrons to "escape?"
Answer: The photoelectric effect.
,●● What happens when short wavelength/high energy light shines on a
metal surface?
Answer: Electrons are emitted.
●● Is there a threshold frequency below which no electrons are emitted?
Answer: Yes.
●● Below the threshold frequency, increasing the intensity has =
Answer: No effect.
●● What did Einstein say about the photoelectric effect?
Answer: Does not depend on the intensity, just on the frequency
(energy).
●● Visible Spectrum
Answer: Light from the sun (white) that can be separated by a prism
(rainbow).
●● Atomic Emission Spectrum
Answer: Light from one particular element does not contain all the
colors of the spectrum.
, ●● Hot gas through a prism =
Answer: Emission Spectrum.
●● Cold gas threw a prism =
Answer: Absorption Spectrum.
●● T/F: The spectrum of an element is the same whether that element is
on earth, sun, or a galaxy far away.
Answer: True.
●● What did Bohr discover?
Answer: Electrons move in orbits around the nucleus at select energy
levels (quantum numbers).
●● How did Bohr explain the emission and absorption spectrum?
Answer: Quantum numbers (n).
●● Are energy levels orbits?
Answer: No.
●● How do electrons transition between energy levels?
Answer: Absorbing or Emitting photons.
QUESTIONS WITH ACCURATE ANSWERS
●● Wavelength =
Answer: Distance from peak to peak.
●● Frequency =
Answer: Number of wavelengths per sec.
●● Amplitude
Answer: Height of a wave.
●● Energy increases as =
Answer: Frequency increases and wavelength decreases.
●● Photoelectric Effect
Answer: The emission of electrons from a metal when light shines on
the metal.
●● Why does adding energy in the form of light (EM radiation) allow
electrons to "escape?"
Answer: The photoelectric effect.
,●● What happens when short wavelength/high energy light shines on a
metal surface?
Answer: Electrons are emitted.
●● Is there a threshold frequency below which no electrons are emitted?
Answer: Yes.
●● Below the threshold frequency, increasing the intensity has =
Answer: No effect.
●● What did Einstein say about the photoelectric effect?
Answer: Does not depend on the intensity, just on the frequency
(energy).
●● Visible Spectrum
Answer: Light from the sun (white) that can be separated by a prism
(rainbow).
●● Atomic Emission Spectrum
Answer: Light from one particular element does not contain all the
colors of the spectrum.
, ●● Hot gas through a prism =
Answer: Emission Spectrum.
●● Cold gas threw a prism =
Answer: Absorption Spectrum.
●● T/F: The spectrum of an element is the same whether that element is
on earth, sun, or a galaxy far away.
Answer: True.
●● What did Bohr discover?
Answer: Electrons move in orbits around the nucleus at select energy
levels (quantum numbers).
●● How did Bohr explain the emission and absorption spectrum?
Answer: Quantum numbers (n).
●● Are energy levels orbits?
Answer: No.
●● How do electrons transition between energy levels?
Answer: Absorbing or Emitting photons.
