Test Preparation on Electromagnetic Wave and Communication-I-Physics Test Series For NEET 2020

In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer, having electron density 10¹¹ per m3

A laser beam of pulse power 10¹² watt is focussed on an object of area 10^-4 cm2. The energy flux in watt/ cm2 at the point of focus is

The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 μH inductor is