Infrared rays are used in

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 (x xx10^(19) , then the value of x is : (Given: h= 6.665xx10^(-34)J-s)

Pick out carcinogens from: Asbestos, Infrared rays, Arsenic, Polythene, Casein, Caffein, Tobacco smoke, Gamma rays.

Give reason for the following: (i) Infrared radiations are used for photography in fog. (ii) Infrared radiations are used for signals during war. (iii) The photographic darkrooms are provided with infrared lamps. (iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum. (v) A quartz prism is required for obtaining the spectrum of ultraviolet light. (vi) Ultraviolet bulbs have a quartz envelope instead of glass.

Why do ultraviolet rays and infrared rays reach the earth's surface in very small amounts?

X-rays can be used

(a) Arrange the following radiations in the order of their increasing wavelength: X-rays, infrared rays, radio waves, gamma rays, and micro waves. (b) Name the radiation which is used for satellite communication

A. Wavelength of microwaves is greater than that of ultraviolet rays. B. The wavelength of infrared rays is lesser than that of ultraviolet rays. C. The wavelength of microwaves is lesser than that of infrared rays D. Gamma ray has shortest wavelength in the electomagnetic specturum Choose the correct option.

A. Wavelength of microwaves is greater than that of ultraviolet rays. B. The wavelength of infrared rays is lesser than that of ultraviolet rays. C. The wavelength of microwaves is lesser than that of infrared rays D. Gamma ray has shortest wavelength in the electomagnetic specturum Choose the correct option.

For the structural analysis of crystals, X-rays are used because

The X-rays were used to induce mutation in Drosophila by