The longest wavelength of light that can be used for the ionisation of lithium atom (Li) in its ground state is \( x \times 10^{-8} \, \text{m} \). The value of \( x \) is __________. (Nearest Integer)
(Given : Energy of the electron in the first shell of the hydrogen atom is \( -2.2 \times 10^{-18} \, \text{J} \) ; \( h = 6.63 \times 10^{-34} \, \text{J s} \) and \( c = 3 \times 10^{8} \, \text{m s}^{-1} \))
