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प्रश्न
Who am I?
Land and water get heated due to me.
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उत्तर
Sunrays
संबंधित प्रश्न
Explain the construction of a calorimeter. Draw the necessary figure.
Calorie is the unit of :
Who am I?
I make things hot or cold.
At 0°C and 760 mm Hg pressure, a gas occupies a volume of 10Q cm3. The Kelvin temperature (Absolute temperature) of the gas is increased by one-fifth while the pressure is increased one and a half times. Calculate the final volume of the gas. [80 cc.]
A body radiates out 300 calories of heat energy. How much heat energy is radiated out by the body in joules?
Name three devices which are used to detect heat radiations.
Explain the following:
Water is heated generally from below.
Give a scientific reason for the following:
In winter the human body covered with a blanket keeps warm.
When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?
While a substance is undergoing a change of state, the temperature of the body remains the same.
