An inductor and a resistor are connected in series to an AC supply. If the potential difference across the inductor and the resistor are 180 V and 240 V respectively, then the voltage of the AC supply is
If electromagnetic waves of power 600 W incident on a non-reflecting surface, then the total force acting on the surface is
When a photosensitive material is illuminated by photons of energy 3.1 eV , the stopping potential of the photoelectrons is 1.7 V . When the same photosensitive material is illuminated by photons of energy 2.5 eV , the stopping potential of the photoelectrons is
The ratio of the kinetic energies of the electrons in the third and fourth excited states of hydrogen atom is
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