Q. 21

Arrange the follo

Answer :

The ranges of electromagnetic waves are given as:


(a) γ-rays = <10ˉ � nm


(b)Microwaves = 0.1 m to 1 mm


(c) x-rays = 1 nm to 10ˉ � nm


(d) Radio waves = >0.1 m


Following is the arrangement of electromagnetic wave in the increasing order of their wavelength:


a) Gamma rays


b) X-rays


c) Micro waves


d) Radio waves


i) When sun light falls on the Earth’s atmosphere, its major part is reflected back in the space. After multiple reflections, the infrared radiations of sunlight are absorbed by the atmosphere because they do not have enough energy to go out of earth’s atmosphere. Infrared radiations have hot radiations so after multiple reflection, they heat up the atmosphere and hence they keep the surface of Earth warm.


ii) In physical therapy the warmth and heat energy of infrared radiations are used. These radiations provide soothing effect in our muscles. They repair and heal up the weak cells and tissues of out body.


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