Question

Assertion (A) : Radiation is the fastest mode of transmission of heat
Reason (R ) : Conduction and convection require a medium for transmission of heat where as heat radiations can travel through vacuum .

. Choose the correct option based upon the above Statements.

a. both A and R are correct and R is the correct explanation of A.

b. both A and R are correct but R is not the correct explanation of A

c. A is correct and R is incorrect

d. both A and R are incorrect​

Answer 1

Answer:

Explanation:

The obtion (b) is the correct answer.

The fastest route of heat transmission is radiation. It transmits heat in the form of electromageneitic waves and does not require any medium. However, because conduction and convection both require a material medium for heat transmission, A and R are accurate, but R is not the proper explanation of A.

So we can say that both A and R are correct and R is not the correct explanation of A.

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Answer 2

Answer:

The option B is correct answer.

Explanation:

Radiation does not need a medium to dissipate its transferred thermal energy.

Radiant heat transfer is controlled by the temperature difference generated by the fourth power (convection and conduction are controlled by the temperature difference generated by the first power).

Radiant heat transfer requires the use of absolute temperature, ie. you have to reckon with Rankin or Kelvin. Convection and conduction can be calculated on any temperature scale, Celsius, Fahrenheit, Kelvin, Rankine, etc.

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