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Q. State any three uses of IR rays.
(a) Infrared lamps are utilized in physiotherapy.
(b) Infrared photographs are utilized in weather forecasting.
(c) As infrared radiations aren't absorbed by thick fog, air, mist and so on they are used to take photograph of long distance objects.
(d) Infra red absorption spectrum is utilized to study the molecular structure.
NEWTON ? "The force which forms an acceleration of 1 ms-2 in a mass of 1 kg". It is represented by N.
At what temperature would the average speed of helium atoms equal (a)the escape speed from Earth, 1.12 ´ 10 4 m/s, and (b) the escape speed from the Moon, 2.37´ 10 3 m/s? (See Ch
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