Infrared Waves

A : infrared waves are often called heat waves. R : Infrared waves vibrate not only the electrons, but entire atoms or molecules of a substance which increases the internal energy and temperature of the substance.

A : infrared waves are often called heat waves. R : Infrared waves vibrate not only the electrons, but entire atoms or molecules of a substance which increases the internal energy and temperature of the substance.

Match List - I (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists: {:(,"List"1 , "List"2) , (1., "Infrared waves" , (i) "To treat muscular strain"), (2., "Radio waves" , (ii) "For broadcasting"), (3., "X- rays" , (iii) "To defect fracture of bones"), (4 ., "Ultraviolet rays" , (iv) "Absorbed by the ozone layer of the atmospher"):}

Match List - I(Electromagnetic wave type) with List - II (Its association / application) and select the correct option from the choices given below the lists. {:(,"List - I",,"List - II"),((a),"Infrared waves",(i),"To treat muscular strain"),((b),"Radiowaves",(ii),"For broadcasting"),((c ),"X - rays",(iii),"To detect fracture of bone"),((d),"Ultraviolet rays",(iv),"Absorbed by the ozone layer of the atmosphere"):}

(i) Why the thin ozone layer on the top of the atmosphere is crucial for human survival ? Identify in which part of electromagnetic spectrum does this radiation belong and write an important application of this radiation. (ii) Why are infrared waves referred to as heat waves ? How are they produced ? What role do they play in maintaining earth.s warmth through the greenhouse effect ?

Complete the paragraph given below by using the appropriate word given below: (optical telescope, X-rays, light, radio telescopes, electromagnetic waves, visible radiation) The ….....................…..which our eyes can see in a tiny part of electromagnetic spectrum. Light has..........................................and it is called radiation. Radiation is seen in the form of visible light, infrared waves, micro-waves as well as in the form of ........................and ultraviolet rays. However, we can see only.................................................... ........ are used to capture visible radiation. But different types of telescopes are used to receive other types of radiation, and all such telescope are called.........................................................................................................................................

Of the following frequencies, which one may be the frequency of an infrared wave?

How are infrared waved produces ?Why are hese referred to as 'heat waves'?Write their one important use.

Match Column-I with Column-II properly : {:("Column-I","Column-II"),("(1) Distance between the earth and stars","(a) kilmeter"),("(2) Wavelength of infrared wave","(b) Light year"),(,"(c) Angstrom"):}