1. . If 2.00 kg of mass is converted to energy, how much energy will be produced
ID: 1875427 • Letter: 1
Question
1. . If 2.00 kg of mass is converted to energy, how much energy will be produced?
A. 1.80 × 10^17 J
B. 6.00 × 10^8 J
C. 1.50 × 10^8 J
D. 6.00 × 10^4 J
E. 9.00 × 10^16 J
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2. When four helium atoms fuse to form one hydrogen atom,
A. the resulting mass of the hydrogen is less than the original mass of the helium.
B. the resulting mass of the hydrogen is exactly the same as the original mass of the helium.
C. the resulting mass of the hydrogen is greater than the original mass of the helium.
D. [The question is misleading; such a reaction does not take place.]
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3. Nuclear reactions within the Sun cause the Sun to
A. increase its mass.
B. decrease its mass.
C. [Either of the above, depending upon the portion of the sunspot cycle.]
D. [None of the above; the Sun’s mass does not change.]
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4. If the rate of fusion reactions in the Sun increased,
A. the Sun would increase in size
B. the Sun would decrease in size.
C. the temperature of the Sun’s core would increase.
D. [Both A and C.]
E. [Both B and C.]
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5. Nuclear fusion releases energy by
A. breaking heavy nuclei into lighter ones.
B. combining light nuclei into heavier ones.
C. exchanging electrons between two atoms.
D. combining nuclei with neutrinos.
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6. The solution to the solar neutrino problem was
A. the Sun’s core is cooling down, producing less neutrinos that expected.
B. the corona is opaque to much of the neutrino radiation.
C. the Earth’s ozone layer absorbs 2/3 of the neutrinos in transit.
D. 2/3 of the neutrinos transform into a new type during the 8 minute trip to Earth.
E. our solar energy equations were just wrong, and needed much reworking.
Explanation / Answer
1) A) 1.80*10^17 J
use Einstein's mass-energy equivalence equation,
E = m*c^2
= 2*(3*10^8)^2
= 1.80*10^17 J
2) D. [The question is misleading; such a reaction does not take place.]
3) B. decrease its mass.
4) E. [Both B and C.]
5) B. combining light nuclei into heavier ones.
6) C. the Earth’s ozone layer absorbs 2/3 of the neutrinos in transit.
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