SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a substance changes state its internal energy ____, but its kinetic energy ____
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stays the same, changes
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changes, stays the same
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -When matter changes state, its internal energy changes, so the kinetic energy of its constituent particles changes. As it is changing from one state to another, the change in energy is reflected in the bonds between the particles, and therefore the temperature of the object doesn’t change.
Detailed explanation-2: -At a given temperature, the particles of any substance have the same average kinetic energy.
Detailed explanation-3: -So, as we go from solid to liquid to gas, the kinetic energy increases, since the space between the particles gets larger as we go from solid to gas.
There is 1 question to complete.