If a moving particle has wavelength (λ), the new wavelength when its kinetic energy is doubled is:
If the radius of the first Bohr's orbit is as, then the radius of the third orbit would be.
242 nm is just sufficient to ionise sodium atom. lonisation energy of sodium atom will be:
If radius of the 2nd orbits in He is 'r' then the radius of the 6th orbit is: