Define radiation. Give example of a heat transfer process that takes place through radiation. (2)
Q8. What is the significance of having a kink in the mercury thermometer? (2)
Q9. Why are radiators of cars painted black? (2)
Q10. Differentiate between conduction, convection and radiation. (3)
Q11. How does a vacuum flask prevent the loss of heat? Explain. (3)
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ANSWER 1. Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of the Earth by the Sun. A less obvious example is thermal radiation from the human body.
ANSWER 2. Kink in the clinical thermometer helps to prohibit the falling of mercury present in the capillary tube into the bulb ensuring that a person should get the correct reading even after taking the thermometer out from his/her mouth.
ANSWER 3.Car radiators are painted dull black because black color is both good absorber and good radiator of heat. The heat generated by the engine is efficiently radiated due to the dull black pain.
ANSWER 4. In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles
ANSWER 5. The vacuum between the glass walls prevents heat loss by preventing radiation. Hint: A vacuum flask or thermos flask is designed so that it will not allow heat loss by any means of conduction or radiation. The vacuum prevents the heat loss by conduction because vacuum is a bad conductor of heat.
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