When the battery across the plates of a charged condenser is disconnected and a dielectric slab is introduced between its plates then the energy stored

The width of central maximum of a diffraction pattern on a single slit does not depend upon

If the amplitude of linear S.H.M. is decreased then

In an n-p-n transistor 200 electrons enter the emitter in 10$$^{-8}$$ second. If 1% electrons are lost in the base, then the current that enters the emitter and the current amplification factor are respectively [e = 1.6 $$\times$$ 10$$^{-19}$$ C]