alleryStart learning →What is the construction of Ferry's blackbody?
AA solid copper sphere painted white
BA hollow double walled sphere with a hole
CA flat polished silver metal plate
DA glass bulb filled with neon gas
Answer & Solution
Correct answer: B. A hollow double walled sphere with a hole
Ferry's blackbody is a double walled hollow sphere with a tiny hole, lampblack inside and a silvered outer surface.
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