`6.25 x 10^18`eV ………………………… J

6.25 x 10^(18) electrons are assembled , What will be the charge?

Energy of an electron in the ground state of hydrogen atom is -2.18 xx 10^(-18) J . Calculate the inoisation enethalpy of atomic hydrogen in J mol^(-1) .

An electron is moving with kinetic energy of '2.275 xx 10^(-25) J .' Calculate its de Broglie wavelength: '(m_e=9.1 xx 10^(-31), kg, h=6.6 xx 10^(-34) Js)'

Calculate the energy required for the process H e^+(g) rarr H e^((2+))(g)+e^- The ionization energy for the H atom in the ground state is 2.18 xx 10^(-18) J atom ^(-1) .

Energy of an electron is given by, E=-2.178 xx10^(-18) 4 ((Z^(2))/(n^(2))) J. Wavelength of light required to excite an electron in hydrogen atom from level n = 1 to n = 2 will be: (h = 6.62 xx 10^(-34) J s and c = 3 xx 10^(8) ms^(-1))