The de- Broglie wavelength associate with the electron in the $n=4$ level is :

Question

$\begin{array}{1 1} \text{two times the de-Broglie wavelength of the electron in the ground state } \\ \text{four times the de-Broglie wavelength of the electron in the ground state } \\ \text{half of the de-Broglie wavelength of the electron in the ground state } \\\frac{1}{4} \text{of the de-Broglie wavelength of the electron in the ground state } \end{array} $