SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When is your answer negative?
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When the sample is cooled or loses heat energy.
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When the sample heats up or gains heat energy.
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When the sample absorbs heat energy.
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None of the above
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Explanation:
Detailed explanation-1: -If Q is less than zero or a negative number, this means that the temperature has gone down. The substance has lost heat, so the heat is negative. The final temperature is lower than the initial temperature, so the sign will be negative.
Detailed explanation-2: -Heat, presented by the symbol Q and unit Joule, is chosen to be positive when heat flows into the system, and negative if heat flows out of the system (see Figure 17.1).
Detailed explanation-3: -In case of saturated vapors, when a certain quantity of heat is removed, the temperature increases. Hence, the specific heat is negative for saturated vapors.
There is 1 question to complete.