Question

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In a solar cooker, the following arrangements are made. Write one function of each arrangement.

(a) The box is made of insulating material such as plastic or wood.

(b) The inner walls of the box are painted black.

(c) The box is covered with a transparent glass sheet.

(d) A plane mirror is hinged at an angle at the top of the box.​

Answer 1

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▶️(a)The box is made of insulating material such as plastic or wood to avoid loss of heat from solar cooker to the surroundings.

▶️(b)The inner walls of the box are painted black because black surface absorbs more heat radiations of incident energy.

▶️(c)The box is covered with a transparent glass sheet because transparent glass sheet does not allow the reflected heat radiation to go outside the box.

▶️(d) Plane mirror is hinged at an angle at the top of the box to increase the amount of solar energy incident on the transparent glass sheet.

Answer 2

Answer:

1) The box of solar cooker is made up of insulating material such as plastic or wood so that the heat doesn't escape.

2) The inner walls of box are painted black because black is the best absorber of light and hence it absorbs most of the sunlight.

3) The box is covered with transparent glass sheet so that the light rays do not get reflected back.

4) The plane mirror is hinged at angle at the top of the box so that the light rays incident on the mirror and more and more reach inside the box.