The de-Broglie wavelength associated with the electron in the $n = 4$ level is:\\
(1) Half of the de-Broglie wavelength of the electron in the ground state\\
(2) Four times the de-Broglie wavelength of the electron in the ground state\\
(3) $\frac { 1 } { 4 }$ th of the de-Broglie wavelength of the electron in the ground state\\
(4) Two times the de-Broglie wavelength of the electron in the ground state