Multiple Choice Stars over their lifetime convert hydrogen to helium to power th
ID: 2304205 • Letter: M
Question
Multiple Choice
Stars over their lifetime convert hydrogen to helium to power their light. The total amount of hydrogen available is proportional to the star’s mass. The rate of consumption of hydrogen is proportional to the star’s luminosity.
1.Which property of a star plays the role of “Initial Wealth and Lifetime Earnings” in the table above?
Mass
Luminosity
Temperature
Radius
Lifetime
unanswered
2. Which property of a star plays the role of “Yearly Spending” in the table above?
Mass
Luminosity
Temperature
Radius
Lifetime
unanswered
3. Which property of a star plays the role of “Money Lasts How Long?”?
Mass
Luminosity
Temperature
Radius
Lifetime
unanswered
4. A star with twice the mass of the Sun has twenty-five times the luminosity of the Sun.
Which star has a longer lifetime the Sun or a star twice as massive?
The Sun
The star that is twice as massive.
unanswered
5. By what factor is the lifetime of the two-solar-mass star shorter or longer than that of the Sun?
The two-solar-mass star lives twice as long.
The two-solar mass star lives the same amount of time as the Sun.
The Sun lives twice as long.
The two-solar mass stars lives one-thirteenth as long.
The two-solar mass lives one-twenty-fifth as long.
Explanation / Answer
1. Initial wealth of a star is the amount of hydrogen it has,hence it's MASS. Certain Temperature is required for the reaction to go on.
2. It's RADIUS will keep on decreasing when reaction goes on...it is the yearly spending.
3 .How long the money lasts will depend on its rare of convertion to helium, hence LUMINOSITY.
4. That star has 2times more hydrogen and 25 times more conversion rate therefore the 2times heavier star will have smaller lifetime.
5. Obviously it's life time will be 1/25 times that of sun.
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