Heat questions | form five Physics

(5663) Question Category: Short answers

Why is the energy of thermal radiation less than that of visible light?

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(5664) Question Category: Mathematical Calculation

A body with a surface area of 5.0​ cm ​ and a temperature of 727°​C radiates 300 joules of
energy in one minute. Calculate its emissivity.

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(5665) Question Category: Short answers

State Newton’s law of cooling.

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(5666) Question Category: Mathematical Calculation

A body cools from 70°​C to 40°​C in 5 minutes. If the temperature of the surroundings is
10°​C ​ , Calculate the time it takes to cool from 50°​C ​ to 20°​C.

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(5667) Question Category: Short answers

What is meant by a thermometric property?

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