Infrared lamps are used in restaurants to keep the food warm. The infrared radiation isstrongly absorbed by water, raising its temperature and that of the food. If the wavelength ofinfrared radiation is assumed to be 1500nm, then the number of photons per second ofinfrared radiation produced by an infrared lamp that consumes energy at the rate of 100 Wand is 12% efficient only is (xx 1019). The value of x is;(Given : h 6625 x 10-34 J-s)

Infrared lamps are used in restaurants to keep the food warm. The infr

1.	Infrared lamps are used in restaurants to keep the food warm. The infrared radiation isstrongly absorbed by water, raising its temperature and that of the food. If the wavelength ofinfrared radiation is assumed to be 1500nm, then the number of photons per second ofinfrared radiation produced by an infrared lamp that consumes energy at the rate of 100 Wand is 12% efficient only is (xx 1019). The value of x is;(Given : h 6625 x 10-34 J-s)
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