Question

1.
The fastest method of heat transfer from a hot body to a cold body is
(a) conduction by convection (c) radiation (d) none of these
2.Polished surfaces are:
(a) good absorbers of heat
(b) good radiators of heat
(c) poor absorbers and poor radiators of heal.
(d) good absorbers and good radiators of heat.
3.Which of these does not require a medium ?
(a) conduction (b) convection (c) radiation (d) none of these
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Answer 1

Answer:

1 ) b) convention

2) a) good absorbers of heat

3) c ) radiation

Answer 2

Answer:

Explanation:

1. The fastest Method of heat transfer from hot body to cold Body is Conduction.
2. Polished surfaces are c)good Radiators of heat and good absorbers of heat
3. Radiation does not require medium

THINGS TO REMEMBER:-

• Conduction is the process in which heat is transferred from one body to another whenever the body is in Contact.
• Convention is the Process in which there is a direct contact but indirectly with the Absorber
• Radiation does not have a direct contact and conduct heat indirectly with the absorber.
• Taking Example of Prism,
• They are made of glass, absorb and radiate heat.
• Remember that Good Absorbers are also good Radiators of Heat
• The Thermos Flask use Radiation via sun to get heated. They do not touch the sun, do they? This is a example of Radiation.