Question
In He-Ne laser, metastable state exists in
fact
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(The coefficient of viscosity of water is $9.8 \times 10^{-6}$ $\left.\mathrm{N} \mathrm{s} / \mathrm{m}^2\right)$

Reason : Accelerated charge produces electromagnetic waves.
Assertion $A:$ $EM$ waves used for optical communication have longer wavelengths than that of microwave, employed in Radar technology.
Reason $R$ : Infrared $EM$ waves are more energetic than microwaves, (used in Radar)
In the light of given statements, choose the correct answer from the options given below: