question_answer

Infrared lamps are used in restaurants to keep the food warm. The infrared radiation is strongly absorbed by water, raising its temperature and that of the food. If the wavelength of infrared radiation is assumed to be 1500 nm, and the number of quanta of infrared radiation produced per second by an infrared lamp (that consumes energy at the rate of 100 W and is 12% efficient only) is\[(x\times {{10}^{19}})\], then find the value of x is.  \[(Given:h=6.625\times {{10}^{-\,34}}Js)\]

Answer:

9