1. The sun\'s atmosphere is a. nonexistent b. less dense than the Earth\'s c. ab
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Question
1. The sun's atmosphere is
a. nonexistent
b. less dense than the Earth's
c. about the same density as Earth's
d. much more dense than Earth's
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2. The Sun appears
a. dimmer at its limb because we see to a lesser depth at the limb.
b. brighter at its limb because we see to a lesser depth at the limb.
c. dimmer at its limb because we see to a greater depth at the limb.
d. brighter at its limb because we see to a greater depth at the limb.
e. No general statement can be made.
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3. The Sun's visible spectrum
a. is a continuous bright spectrum
b. is a continuous bright spectrum, with thousands of dark absorption lines.
c. is a continuous spectrum with many dark absorption and bright emission lines.
d. consists only of a few bright emission lines.
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4. Which of the phenomena below are associated with solar flares?
a. chemical reactions in the Earth's core.
b. nuclear reactions in the Earth's magnetosphere.
c. Auroras
d. hurricanes
e. volcanoes
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5. The solar phenomena which are sources of particles traveling out into the solar system from the Sun
a. Prominences
b. flares
c. coronal holes.
d. all of the above
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6. The core of the Sun takes up about
a. 1/8 of the sun's volume
b. 1/64 of the sun's volume
c. 1/1000 of the sun's volume
d. less than 1/1000 of the sun's volume
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7. Why does a helium nucleus have less mass than the four protons that went in?
A. Some of the rest mass of the protons is converted into light, which then acts to create more protons, driving more fusion.
B. Some of the rest mass of the protons is converted into energy.
C. Some of the rest mass of the protons is converted into massive neutrinos, which then goes into heating the Sun.
D. Some of the rest mass of the protons is converted into gravitational waves, which then serve to increase the mass of the Sun.
E. Some of the rest mass of the protons is converted into gluons which bind the nuclei together.
Explanation / Answer
1) The sun's atmosphere is
a. nonexistent
b. less dense than the Earth's
c. about the same density as Earth's
d. much more dense than Earth's
ANSWER is : b. less dense than the Earth's
EXPLANATION :
The sun's atmosphere is less dense than the Earth's. The Sun's chromosphere appears as a rim of red light during a solar eclipse. The lower region of the Sun's atmosphere is called the chromosphere. ... It is about ten thousand times less dense than the underlying photosphere, and more than a million times less dense than Earth's atmosphere.
2) The Sun appears
a. dimmer at its limb because we see to a lesser depth at the limb.
b. brighter at its limb because we see to a lesser depth at the limb.
c. dimmer at its limb because we see to a greater depth at the limb.
d. brighter at its limb because we see to a greater depth at the limb.
e. No general statement can be made.
ANSWER is : a. dimmer at its limb because we see to a lesser depth at the limb.
EXPLANATION :
Limb darkening is an optical effect in which center part of the disk appears brighter than the edge or limb
Limb darkening defined as gradual decrease in brightness of the disk of the Sun or of another star as observed from its cent*r to its edge, or limb.
Limb darkening is because solar atmosphere increases in temperature with depth.
- At the ce*tre of the solar disk, there is deepest and warmest layers that emit the most light.
- At the limb, only the upper, cooler layers produces less light.
3) The Sun's visible spectrum
a. is a continuous bright spectrum
b. is a continuous bright spectrum, with thousands of dark absorption lines.
c. is a continuous spectrum with many dark absorption and bright emission lines.
d. consists only of a few bright emission lines.
ANSWER is : c. is a continuous spectrum with many dark absorption and bright emission lines.
EXPLANATION :
The visible spectrum of the Sun shows hundreds of dark absorption lines that are superimposed on a bright continuous spectrum.
Sun's spectrum has the presence of dark lines that are caused by the Sun atmosphere absorbing light at certain wavelengths which causes the intensity of the light at this wavelength to decrease and appear dark. The atoms and molecules in a gas will absorb only certain wavelengths of light and these pattern are unique to each element and explained what elements make up the atmosphere of the Sun.
4) Which of the phenomena below are associated with solar flares?
a. chemical reactions in the Earth's core.
b. nuclear reactions in the Earth's magnetosphere.
c. Auroras
d. hurricanes
e. volcanoes
ANSWER Is : b. nuclear reactions in the Earth's magnetosphere.
EXPLANATION :
On an average, solar flares erupt from active regions on the Sun where magnetic fields are much stronger.
Flares occur when charged particles mainly electrons, speed up and interact with the plasma medium. The phenomenon of magnetic reconnection leads to this copious acceleration of charged particles....
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