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Question
The isotope Cesium-137, which has a half-life of 30 years, is a product of nuclear power plants. How long will it take for this isotope to decay to about one-sixteenth its original amount?A) 480 years
B) 240 years
C) 120 years
D) 960 years
Answer
This answer is hidden. It contains 1 characters.
Related questions
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Heat energy is measured in units of
A) degrees.
B) joules.
C) calories.
D) both joules and calories.
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When the temperature of a fixed volume of air initially at 0 C is lowered by 1 degree, its pressure
A) decreases by 1/273.
B) decreases by 100/273.
C) increases by 1/273.
D) increases by 100/273.
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Which of these is the smallest?
A) 1 Celsius degree
B) 1 kelvin
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Distinguish between the concepts of thermal energy, temperature, and heat.
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Water at 4C will expand when it is slightly
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B) warmed.
C) both of these
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If water at 0C slightly increases in temperature, the water
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If water at 20C slightly increases in temperature, the water
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A kg of 40C water and a kg of 20C water, after being mixed, have a temperature of 30C. However, the final temperature of a 1-kg iron block at 40C placed into 1 kg of water at 20C is
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A) becomes more ordered.
B) becomes less ordered.
C) reaches equilibrium.
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When work is done by a system and heat is subtracted, the temperature of the system
A) increases.
B) decreases.
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Which law of thermodynamics addresses the direction of heat flow?
A) First law
B) Second law
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D) all of the above
Q:
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A) First law
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Q:
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is
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B) half as much.
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Newton discovered
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C) neither of these
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B) rise and fall back to Earth's surface.
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