Home
Class 11
PHYSICS
Assertion : A body that is a good radiat...

Assertion : A body that is a good radiator is also a good absorber of radiation at a given wavelength.
Reason : According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength

A

If both assertion and reason are correct and reason is a correct explanation of the assertion.

B

If both assertion and reason are correct but reason is not the correct explanation of assertion.

C

If assertion is correct but reason is incorrect.

D

If assertion is incorrect but reason is correct.

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • THERMAL PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise COMPETITION FILE (MATRIX MATCH TYPE QUESTION )|2 Videos

  • THERMAL PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise COMPETITION FILE (INTEGER TYPE QUESTION )|12 Videos

  • THERMAL PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTION ((D ) MULTIPLE CHOICE QUESTION BASED ON A GIVEN PASSAGE/COMPREHENSION )|9 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    MODERN PUBLICATION|Exercise Chapter Practice Test (for Board Examination)|16 Videos

  • UNITS AND MEASUREMENT

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|15 Videos

Similar Questions

Explore conceptually related problems

Assertion : Perspiration from human body helps in cooling the body. Reason : A thin layer of water on the skin enhances its emissivity.

A body, which emits radiations of all possible wavelengths, is known as

The Kirchhoff's law leads to the conclusion that the good radiators of thermal radiations are

Assertion(A) Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason(R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

Assertion : All black coloured objects are considered black bodies. Reason : Black colour is a good absorber of heat

Assertion : Bodies radiate heat at all temperatures. Reason : Rate of radiation of heat is proportional to the fourth power of absolute temperature.

Assertion : When temperature of a body is increased, in radiant energy, number of low wavelength photons get increased. Reason : According to Wien's displacement law lambda_m prop 1/T .

Assertion : Coefficient of absorption of radiation of an ideal black body is 1 . Reason : An ideal black body emits radiation of all wavelengths.