Physics waec 1990

Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?

a

Wrapping it in cotton wool

b

painting it black

c

Placing it in a vacuum

d

Placing it on rubber supports

e

Keeping it in a closed wooden box

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Correct Option
b

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Discussions (3)

sammy6829
11 years ago

option b is correct because the color black conducts heat

Tim234D
1 year ago

It is black because according to Kirchhoff's radiation law, good absorbers of heat are also goid radiators of heat. Thus, black, being a good absorber of heat, is also a good radiator of heat.

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