Q.

Which of the following parts of the sunlight makes the solar cooker hot?

A. Ultra violet
B. Red light
C. Infra red
D. Cosmic rays
Answer» C. Infra red
Explanation: Glass transmits visible light but blocks infrared thermal radiation from escaping. This amplifies the heat trapping effect. A solar cooker, or solar oven, is a device which uses the energy of direct sunlight to heat food or drink to cook it or sterilize it. The vast majority of the solar cookers presently in use are relatively cheap, low-tech devices.
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