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AST 111 final Exam | Questions with Verified Answers
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AST 111 final Exam | Questions with Verified Answers
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AST 111 final Exam | Questions with VerifiedAnswers
Why are false-color images useful? - ✔✔We can't see most of the electromagnetic spectrum
so false-color images provide something we can see.
What technologies are available to astronomers to increase the resolution of astronomical
images? - ✔✔Adaptive Optics
Why is interferometry easier to carry out with radio telescopes than with optical telescopes? -
✔✔Optical light's wavelength is very short.
A nucleus with 6 protons will have a higher/lower/equal charge than a nucleus with 7 protons?
- ✔✔Depends on electrons
A nucleus with 6 protons and 6 neutrons will have a higher/lower/equal charge than a nucleus
with 6 protons and 7 neutrons? - ✔✔Equal
A neutral atom of carbon will have six protons and (blank) electrons - ✔✔6
An atom will stop being neutral if a neutron is added to its nucleus.
(T/F) - ✔✔F
Two isotopes of oxygen will have the same number of (blank) but different number of (blank) -
✔✔protons, neutrons
The two most common isotopes of carbon have 6 and 8 protons, respectively.
(T/F) - ✔✔False
,A molecule is made out of two or more (blank) - ✔✔atoms
An electron will emit energy when it is pulled away from its atom.
(T/F) - ✔✔False
An electron with a high binding energy will be more/less tightly bound than an electron with a
low binding energy? - ✔✔more
Two electrons with the same binding energy could have orbits of different sizes, depending on
the atom they are bound to.
(T/F) - ✔✔True
The chemical composition of a gas can be determined by analyzing the photons emitted when
electrons return the the ground state.
(T/F) - ✔✔True
An electron will absorb a photon when returning to the ground state.
(T/F) - ✔✔False
Two identical atoms will have the same/different energy levels - ✔✔Same
A neon sign that contains exclusively neon gas could have a blue-greenish glow.
(T/F) - ✔✔False
Rank the following stars from coldest to hottest: Aldebaran(red star), Alpha Centauri (yellow
star), Bellatrix (blue-white star), Vega (white star) - ✔✔Aldebaran, Alpha Centauri, Bellatrix,
Vega
, Heat/thermal energy is the flow of heat/thermal energy - ✔✔Heat, Thermal energy
Only the hottest objects, such as stars, have a blackbody spectrum.
(T/F) - ✔✔False
Hot objects have more thermal energy than cold objects.
(T/F) - ✔✔True
A star of the same size as the Sun but with a surface temperature three times as hot as the
Sun's will emit (blank) times more energy than the Sun. - ✔✔81
Stefan-Boltzmann law
A star with a temperature of 5800K will emit most intensely at a wavelength of (Blank) nm. This
corresponds to UV/Visible/IR. - ✔✔500, visible light
Wein's Law
Max wavelength=2.9e6/T
A star with a temperature of 3000K will have a smaller/larger/equal max wavelength than a star
with a temperature of 5000K. - ✔✔Larger
Humans emit more infrared radiation than a star with a wavelength of maximum intensity in
the UV.
(T/F) - ✔✔True
How is a continuous spectrum produced? - ✔✔Passing white light through a prism
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