Discussion
Assertion (A): An incandescent lamp approximates a blackbody closely.
Reason (R): It emits by thermal radiation from a heated tungsten filament.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A tungsten filament emits by being hot, which is precisely the blackbody mechanism, so its spectrum is a smooth continuum closely following Planck’s law. The departure comes only from tungsten’s emissivity varying somewhat with wavelength, which is why the match is close rather than exact.
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