The discovery of Infrared waves was done by Herschell. The frequency of these waves is in between \( 3 \times 10^{11} \mathrm{~Hz} \) to \( 4 \times 10^{14} \mathrm{~Hz} \). These are also known as heat waves because due to absorption of these waves heating effect in the bodies is observed. These waves are produced by hot bodies. The infrared waves are used in physical therapy to reduce or treat muscular strain. These waves also give electrical energy to satellites with the help of solar cells.
These waves are also helpful in taking photographs during fog, smoke etc. These also keep warm the plants in green houses. Weather forecasting is also done by infrared photography. These are also helpful in the study of molecular structure.
These waves give energy to satellites.
(A) Mechanical
(B) Magnetic
(C) Electrical
(D) None of these
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