chem 141 learning objectives Exam 2025
Questions and Answers
describe the relationship between the frequency, wavelength, and velocity, of a
wave - --CORRECT ANSWER--They are inversely related as wavelength
decreases frequency will increase.
Rank electromagnetic radiation from highest to lowest (energy, wavelength,
frequency) - --CORRECT ANSWER--Energy and frequency are the same -
(gamma, x-rays, ultra violet, visible, inferaed, microwaves, radio waves
evidence for why light is a wave - --CORRECT ANSWER--the double slit
experiment, proves that through interface patterns that light also behaves as a
wave.
Make a C.E.R. for why light is a wave - --CORRECT ANSWER--c- light is a wave
E-when light shines through 2 slits a diffraction pattern is visible R-When waves
are in there is more wave intensity because of constructive interference making a
brighter light. When waves are out of phase a destructive interference occurs and
waves cancel out producing dark light.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
, give evidence for why electromagnetic radiation is a particle - --CORRECT
ANSWER--Because of the photoelectric effect
Using the photoelectric effect experiment draw and explain graphs that show the
number of elections ejected vs frequency or wavelength of radiation that shines on
the metal - --CORRECT ANSWER--As the intensity increases so does the amount
of electrons being ejected, however if the frequancy is not aleast at 2 then no
electrons can be ejected at all. (purple and blue light eject electrons and red light
does not)
Explain why the existence of photons (quantized light energy) explains the
photoelectric effect - --CORRECT ANSWER--Because the threshold frequancy is
the minimum energy required to emit an electron, if photons do not have enough
energy to emit and electron, an electron will not be emitted regardless of the
intensity.
photons - --CORRECT ANSWER--quantized light energy.
Make a C.E.R for why light is a particle. - --CORRECT ANSWER--C. light is a
particle E. Light is a particle because of the photoelectric affect R. During the
photoelectric effect electrons with a high enough frequency produce electrons but
if the frequency is not high enough no electrons are ejected. As the intensity
increase so will the amount of electrons ejected if ofc the frequency is high enough
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
Questions and Answers
describe the relationship between the frequency, wavelength, and velocity, of a
wave - --CORRECT ANSWER--They are inversely related as wavelength
decreases frequency will increase.
Rank electromagnetic radiation from highest to lowest (energy, wavelength,
frequency) - --CORRECT ANSWER--Energy and frequency are the same -
(gamma, x-rays, ultra violet, visible, inferaed, microwaves, radio waves
evidence for why light is a wave - --CORRECT ANSWER--the double slit
experiment, proves that through interface patterns that light also behaves as a
wave.
Make a C.E.R. for why light is a wave - --CORRECT ANSWER--c- light is a wave
E-when light shines through 2 slits a diffraction pattern is visible R-When waves
are in there is more wave intensity because of constructive interference making a
brighter light. When waves are out of phase a destructive interference occurs and
waves cancel out producing dark light.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
, give evidence for why electromagnetic radiation is a particle - --CORRECT
ANSWER--Because of the photoelectric effect
Using the photoelectric effect experiment draw and explain graphs that show the
number of elections ejected vs frequency or wavelength of radiation that shines on
the metal - --CORRECT ANSWER--As the intensity increases so does the amount
of electrons being ejected, however if the frequancy is not aleast at 2 then no
electrons can be ejected at all. (purple and blue light eject electrons and red light
does not)
Explain why the existence of photons (quantized light energy) explains the
photoelectric effect - --CORRECT ANSWER--Because the threshold frequancy is
the minimum energy required to emit an electron, if photons do not have enough
energy to emit and electron, an electron will not be emitted regardless of the
intensity.
photons - --CORRECT ANSWER--quantized light energy.
Make a C.E.R for why light is a particle. - --CORRECT ANSWER--C. light is a
particle E. Light is a particle because of the photoelectric affect R. During the
photoelectric effect electrons with a high enough frequency produce electrons but
if the frequency is not high enough no electrons are ejected. As the intensity
increase so will the amount of electrons ejected if ofc the frequency is high enough
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
