Question 4. (20 Marks) Assume that an electron, which is in the ground state of an atom, is moving at 10% the velocity of light around the atom's core in a circular orbit. (Take velocity of light =3108m/s) (a) Calculate the de Broglie wavelength of the electron. (b) Calculate the Bohr radius of this atom from the quantities calculated in (a). (c) Calculate the energies (in eV ) for the first three allowed orbits of the hydrogen atom. (d) Suppose an electron jumps from the n=1 orbit to the n=3 orbit in hydrogen. Calculate the wavelength (in angstrom) of radiation absorbed during this process. Is the absorbed light visible