Question

Q1 Which of the following containing same amount of boiling hot water is likely to cool first and why ?
(a) A beaker whose surface is covered with aluminium foil ,
(b) A beaker whose surface is painted black.
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Answer 1

A beaker whose surface is painted black will cool first as black bodies radiate heat faster. It will radiate heat at a higher rate than the other beaker that is covered and will cool quickly. Hence (b) is the correct option.

Answer:

option:b...

Explanation:

i hope ...it's okay...