1-Types of Spectra 2-Doppler Shift 3-Atomic Absorption and Emission of Lightanswear the qustion in the files below
hw_types_of_spectra__1_.pdf

hw_absorption_and_emission_atoms.pdf

hw_doppler_shift.pdf

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Name:__________________________________________ Section:___________
Homework: Absorption and Emission of Light by Atoms
1. Answer true or false to the following questions:
a) An emission line results from an electron falling from a higher to lower energy orbital
around its atomic nucleus. True/False
b) An absorption line results from an electron falling from a higher to lower energy orbital
around its atomic nucleus. True/False
c) Spectral lines are produced when an electron makes a transition from one energy state to
another. True/False
d) A neutron is emitted when an electron falls from a higher to lower orbital. True/False
Correct any false statements above.
2. A solid, glowing-hot object will emit light over a range of wavelengths resulting in a continuous
spectrum. If a diffuse (not dense) and relatively cool gas cloud is located between the glowing,
hot object and an observer.
a) What type of spectrum will the observer detect from the cloud of gas? (circle one)
continuous spectrum
absorption spectrum
emission spectrum
Explain the reasoning behind your choice:
b) In this example is light being absorbed or emitted by the gas?
c) Below is a sketch of one of the atoms in the diffuse cool cloud of gas described in the previous
question. Sketch what will happen to an electron in this atom to cause the type of spectrum
from the previous question. Use a dot to represent the electron, a straight arrow to represent
the motion of the electron, and a squiggly arrow to represent the photon.
3. Imagine that you are looking at a neon sign in a store window that says “OPEN.” This sign is
made from a tube filled with a gas of neon atoms. The neon gas is given energy using electricity
and as a result the gas gives off mostly red light.
a) What type of spectrum will the observer detect from the neon gas? (circle one)
continuous spectrum
absorption spectrum
emission spectrum
Explain the reasoning behind your choice:
b) In this example is light being absorbed or emitted by the gas?
c) Below is a sketch of one of the atoms in the hot neon gas described in the previous question.
Sketch what will happen to an electron in this atom to cause the type of spectrum from the
previous question. Use a dot to represent the electron, a straight arrow to represent the motion
of the electron, and a squiggly arrow to represent the photon.
Name:__________________________________________ Section:___________
Homework: Doppler Shift
The figure below shows a spaceprobe and five planets (A-E). The motion of the spaceprobe is indicated
by the arrow. The spaceprobe is continuously broadcasting a radio signal in all directions.
A
D
C
B
E
1. Which planets will receive a radio signal that is redshifted? Explain your reasoning.
2. Which planets will receive a radio signal that is shifted to shorter wavelengths? Would this type of
shift be a redshift or a blueshift? Explain your reasoning.
3. Will all the planets receive radio signals from the spaceprobe that are Doppler shifted? Explain your
reasoning.
4. How will the size of the Doppler shift in the radio signals detected at Planet A and Planet B compare?
Explain your reasoning.
5. How will the size of the Doppler shift in the radio signals detected at Planet E and Planet B compare?
Explain your reasoning.

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