SESSION 30
I. ANSWER THE FOLLOWING QUESTIONS:
1.Distinguish between reflection of heat and absorption of heat.
2.Clean snow does not melt easily in sunlight. Why?
3.Why cooling fans at the back of a refrigerator are painted black?
4.Give one example of heat transfer by radiation.
SESSION 31:
II. SOLVE THE NUMERICALS :
1.The temperature of two bodies differ by 10℃ on the Celsius scale. How much will they differ on the i) Fahrenheit scale ii) Kelvin scale ?
2.Convert 10℃ in i) Fahrenheit scale ii) Kelvin scale.
3.The normal temperature of human body is 37℃ . What will be its value on the i) Fahrenheit scale ii) Kelvin scale?
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Answers
Answer:
1)Reflection — how much light reflects from a surface. ... Absorption — The tendency of a material to absorb some part of the light and convert it to heat, or perhaps some other form of energy.
2)Snow does not melt on a spring day because of the sun's heat. It melts because of the warm air from the sea. ... But when the sunlight penetrates a thick layer of ice before it can be absorbed, it cannot raise the temperature of the ice to melting point quickly enough.
3) Since black is a good heat-absorbing color, it is also a good heat-radiating color. ... One of the things the external coils do is radiate heat, so they are painted black to help that process.
4)for example. Heat transfer by radiation occurs when microwaves
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Answer:
A solar thermal collector collects heat by absorbing sunlight. The term "solar collector" commonly refers to a device for solar hot water heating, but may ..