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Q.

Consider the following statements.(A) A body that is a good radiator is also a good absorber of radiation at a given wavelength.(B) According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength.Select the correct option.(a) (A) is false but (B) is true.(b) Both (A) and (B) are true.(c) (A) is true but (B) is false.(d) Both (A) and (B) are false.

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a

Both (A) and (B) are true.

b

(A) is true but (B) is false.

c

(A) is false but (B) is true.

d

Both (A) and (B) are false.

answer is A.

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Detailed Solution

Both A and B are true they are theoretical and factual statements.
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Consider the following statements.(A) A body that is a good radiator is also a good absorber of radiation at a given wavelength.(B) According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength.Select the correct option.(a) (A) is false but (B) is true.(b) Both (A) and (B) are true.(c) (A) is true but (B) is false.(d) Both (A) and (B) are false.