Name the electromagnetic waves which are produced by the following: (i) Radioactive decays of nucleus (ii) Welding arcs (iii) Hot bodies Write one use each of these waves.
Electromagnetic waves of wavelengths λ₁, λ₂ and λ₃ are used in radar systems, in water purifiers and in remote switches of TV, respectively.
Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purifier. Name the two sources of these radiations.
To dissociate an oxygen molecule into two oxygen atoms 5eV of energy is required. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in
A welder wears special glasses to protect his eyes mostly from the harmful effect of
State any one source of ultraviolet radiations.
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