Chem 141 exam 2 2025 Questions and
Answers
Light is a wave is what... - --CORRECT ANSWER--claim
Evidence for claim light is a wave - --CORRECT ANSWER--When light shines
through a double slit a pattern of bright and dark lines appear
Reasoning for evidence that light is a wave - --CORRECT ANSWER--Waves of
light interfere constructively when they arrive in-phase and destructively when they
arrive out-of-phase.
What are emission lines - --CORRECT ANSWER--colors of light being emitted by
an element (colored lines in black spectrum)
Hydrogen produces emission lines with the following wavelengths: 410nm, 434nm,
486nm and 656nm. Where would you expect to see the absorption lines for
Hydrogen on its absorption spectrum? - --CORRECT ANSWER--Absorption
lines would appear at exactly the same wavelengths
What are absorption lines - --CORRECT ANSWER--The dark lines
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, Why would absorption lines appear exactly the same wavelengths? - --CORRECT
ANSWER--the energies emitted and absorbed by hydrogen are the same.
Which Photon of light has the longest wavelength?
E=1x10^-12J E=5x10^-18
E=8x10^-16J. E=2x10^-19J - --CORRECT ANSWER--E=2x10^-19J
What causes longer wavelength? - --CORRECT ANSWER--lower frequencys
Light is a particle is what... - --CORRECT ANSWER--Claim
Evidence that light is a particle - --CORRECT ANSWER--When light shines on
metal there is a threshold frequency, below which no electrons are ejected from a
metal.
What wavelength radiation does 30 Kilohertz correspond to? - --CORRECT
ANSWER--1x10^4m
Wavelength = what / what - --CORRECT ANSWER--Speed of light / frequency
speed of light (c) - --CORRECT ANSWER--3x10^8 m/sec
1 Kilohertz = ___ Hertz - --CORRECT ANSWER--1000
why do we consider the wave properties of electrons but not wave properties of
macroscopic objects? - --CORRECT ANSWER--The wavelength of the electron is
similar to size of the atom and has an affect on properties. Wavelengths of
macroscopic objects are way smaller than the object and don't affect its properties.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
Answers
Light is a wave is what... - --CORRECT ANSWER--claim
Evidence for claim light is a wave - --CORRECT ANSWER--When light shines
through a double slit a pattern of bright and dark lines appear
Reasoning for evidence that light is a wave - --CORRECT ANSWER--Waves of
light interfere constructively when they arrive in-phase and destructively when they
arrive out-of-phase.
What are emission lines - --CORRECT ANSWER--colors of light being emitted by
an element (colored lines in black spectrum)
Hydrogen produces emission lines with the following wavelengths: 410nm, 434nm,
486nm and 656nm. Where would you expect to see the absorption lines for
Hydrogen on its absorption spectrum? - --CORRECT ANSWER--Absorption
lines would appear at exactly the same wavelengths
What are absorption lines - --CORRECT ANSWER--The dark lines
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
, Why would absorption lines appear exactly the same wavelengths? - --CORRECT
ANSWER--the energies emitted and absorbed by hydrogen are the same.
Which Photon of light has the longest wavelength?
E=1x10^-12J E=5x10^-18
E=8x10^-16J. E=2x10^-19J - --CORRECT ANSWER--E=2x10^-19J
What causes longer wavelength? - --CORRECT ANSWER--lower frequencys
Light is a particle is what... - --CORRECT ANSWER--Claim
Evidence that light is a particle - --CORRECT ANSWER--When light shines on
metal there is a threshold frequency, below which no electrons are ejected from a
metal.
What wavelength radiation does 30 Kilohertz correspond to? - --CORRECT
ANSWER--1x10^4m
Wavelength = what / what - --CORRECT ANSWER--Speed of light / frequency
speed of light (c) - --CORRECT ANSWER--3x10^8 m/sec
1 Kilohertz = ___ Hertz - --CORRECT ANSWER--1000
why do we consider the wave properties of electrons but not wave properties of
macroscopic objects? - --CORRECT ANSWER--The wavelength of the electron is
similar to size of the atom and has an affect on properties. Wavelengths of
macroscopic objects are way smaller than the object and don't affect its properties.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
