On a sunny day, it is cool in the shade below a tree but not away from it because:

Air trapped between leaves is a good conductor of heat.

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Heat radiation travel in straight line.

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The tree produces cold air

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None of these

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Solution

The correct option is B
Heat radiation travel in straight line.

It is cool in the shade below a tree but not away from it because the tree leaves reduce the amount of sunlight falling under it. Since the intensity is reduced, the person sitting under the tree feels cold.

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Question 2

A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because:

(a) Friction between the layers of newspaper produces heat

(b) Air trapped between the layers of newspaper is a bad conductor of heat.

(d) Newspaper is at a higher temperature than the temperature of the surrounding.

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