Calculate the radius of third Bohr orbit of hydrogen atom and the energy of electrons in that orbit. ` (h= 6.625 * 10^-34)` JS , `(epsilon_0 = 8.85*106^-12 FM^-1)` , `(e= 1.6 * 10^-19 C)` , `(m_0 = 9.1 * 10^-31 Kg)`

The velocity of electron in the n^(th) Bohr orbit of hydrogen atom is 1.09xx10^(6)ms^(-1) . Velocity of electron in the same Bohr orbit of He^(+) is

Calculate the energy of 1 mole of photons whose frequency is 6.0xx10^(14) Hz.

Calculate the energy of radiation emitted for the electronic transition from infinity to ground state for hydrogen atom. Given c = 3xx10^(8)" ms"^(-1), R_(H) = 1.09678 xx 10^(7) m^(-1), h = 6.6256 xx 10^(-34)" J s"^(-1)

What is the wavelength of an electron if its kinetic energy is '4.55 xx 10^(-25)' Joules? (Mass of electron '=9.1 xx 10^(-31) kg' and 'h=6.6 xx 10^(-34) kgm^2 s^(-1)' )