Infrared radiation is detected by...

Infrared radiation is detected by

Spectrometer

Pyrometer

Nanometer

Photometer

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Consider the following types of electromagnetic radiation: radiowaves, infra-red, vissible light. Which of the following statements are correct? (i) Only radiowaves can be used to transmite audio information. (ii) Only infrared radiation is emitted by very hot object. (iii) Only visible light can be detect by humans.

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Infrared lamps are used in restaurants to keep the food warm. The infrared radiation is strongly absorbed by water, raising is temperature and that of the food. If the wavelength of infrared radiation is assumed to be 1500nm , then the number of photons per second of infrared radiation produced by an infrared lamp that consumes energy at the rate of 100W and is 12% efficient only is y xx 10^(19) . Find the value of y .

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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 radiationis assumed to be 1500 nm, and the number of quanta of infrared radiation produced per second by an infrared lamp (that consumes enregy at the rate of 100 W and is 12% effcient only) is (xx10^(19) , then the value of x is : (Given: h= 6.665xx10^(-34)J-s)

MOTION-HEAT TRANSFER & THERMAL EXPANSION -Exercise - 3 Section-B

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