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Flow of Heat

Black objects...

Question

Black objects radiate more heat than white objects. Give two everyday uses of this principle.

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Solution

1-The back of refrigerator are coloured dull black to radiate heat more effectively in order to cool down the refrigerator pipes.
2-Electric hot plates are coloured black to radiate maximum heat.

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Q. Black objects absorb more heat than white or polished ones. Give two daily uses of this principle.

Q. How does the dark or light colour of an object affect the amount of heat it radiates or absorbs?

(a) Dark colour objects absorb and radiate more heat than light coloured objects.
(b) Dark colour objects absorb more but radiate less heat than light coloured objects.
(c) Dark colour objects absorb less and radiate more heat than light coloured objects.
(d) Dark colour objects absorb and radiate the same amount of heat as light coloured objects.

Q. Give two examples from everyday life where heat is transmitted by radiation.

Q. Read the following paragraph and answer the questions.
If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy.
The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box.
i. Heat is transferred from where to where?
ii. Which principle do we learn about from this process?
iii. How will you state the principle briefly?
iv. Which property of the substance is measured using this principle?

Name any five objects used in our everyday life which are made of metals.

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