ASTR 102 exam With Questions & 100% Solutions| A Guaranteed
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Course
ASTR 102
Institution
ASTR 102
What is the period of the solar magnetic cycle?
a)27 days
b)1 year
c)11 years
d)22 years
e)220 years - 2: What is the period of the solar magnetic cycle?
a)27 days
b)1 year
ASTR 102 exam With Questions &
100% Solutions| A Guaranteed
What is the period of the solar magnetic cycle?
a)27 days
b)1 year
c)11 years
d)22 years
e)220 years - ✔✔2: What is the period of the solar magnetic cycle?
a)27 days
b)1 year
c)11 years
*d)22 years (need to consider direction of magnetic field)*
e)220 years
Which atmospheric feature is NOT associated with magnetic field?
a)Coronal hot spot
b)Plage
c)Sunspot
d)Prominence
e)Flare - ✔✔1: Which atmospheric feature is NOT associated with magnetic
field? a)Coronal hot spot
b)Plage
c)Sunspot
d)Prominence
e)Flare
*ALL ARE ASSOCIATED WITH MAGNETIC FIELDS*
, In the core of the Sun now, the energy is produced
by a)Combustion of H and He
b)Gravitational collapse
c)Fission of Uranium and other radioactive nuclei
d)Fusion of 4 hydrogen nuclei into 1 helium nucleus
e)Fusion of all the elements less massive than iron - ✔✔1. In the core of the Sun now, the energy
is produced by
a)Combustion of H and He
b)Gravitational collapse
c)Fission of Uranium and other radioactive nuclei
*d)Fusion of 4 hydrogen nuclei into 1 helium nucleus*
e)Fusion of all the elements less massive than iron
In order for hydrogen to helium fusion to occur in the core of a star, the temperature has to be
greater than about
373 K (100 ° C, 212 ° F)
10 thousand K
10 million K
1 billion K
10 billion K - ✔✔2. In order for hydrogen to helium fusion to occur in the core of a star,
the temperature has to be greater than about
373 K (100 ° C, 212 ° F)
10 thousand K
*c) 10 million K*
1 billion K
10 billion K
In addition to visible light, which of the following forms of electromagnetic radiation can reach Earth's
surface, passing through the atmosphere?
radio
infrared
, ultraviolet
x-rays
gamma-rays - ✔✔1. In addition to visible light, which of the following forms of
electromagnetic radiation can reach Earth's surface, passing through the atmosphere?
*a) radio*
infrared
ultraviolet
x-rays
gamma-rays
The light gathering power of a telescope is proportional to the ______; the resolution of a telescope is
proportional to the ______?
diameter; diameter
diameter squared; diameter
diameter; diameter squared
diameter squared; diameter squared
diameter squared; inverse of diameter (1 / diameter) - ✔✔2. The light gathering power of a
telescope is proportional to the ______; the resolution of a telescope is proportional to the ______?
diameter; diameter
diameter squared; diameter
diameter; diameter squared
diameter squared; diameter squared
*e) diameter squared; inverse of diameter (1 / diameter)*
Which is not a component of the interstellar medium (ISM)
gas? A) Neutral atoms
B) Ionized atoms
C) Electrons
D) Molecules
, All of the above are components of ISM - ✔✔1: Which is not a component of the
interstellar medium (ISM) gas?
A) Neutral atoms
Ionized atoms
Electrons
Molecules
*E) All of the above are components of ISM AND DUST*
How much energy does it take to ionize a hydrogen atom from its ground state (n=1 level)?
A) eV
B) 1.24 eV
C) 3.4 eV
D) 10.2 eV
13.6 eV - ✔✔2: How much energy does it take to ionize a hydrogen atom from its ground
state (n=1 level)?
eV
1.24 eV
3.4 eV
10.2 eV
*E) 13.6 eV* (λ = 91.2 nm; 912 Å; 0.091 µm)
What part of the electromagnetic spectrum does a photon of 21-cm correspond
to? A) X-ray
B) Ultraviolet
C) Visible D)
Infrared
E) Radio - ✔✔3: What part of the electromagnetic spectrum does a photon of 21-cm correspond
to? A) X-ray
B) Ultraviolet
C) Visible D)
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