Problem

The de Broglie wavelength connects the particle nature of the electron to its wave nature through $\lambda = h/p$, where $p$ is momentum. In the Bohr model, the electron orbits at specific energy levels, each with a definite velocity and radius—so you'll need to find the electron's momentum at that level using the Bohr radius and the relationship between orbital velocity and the principal quantum number. Once you have momentum, the wavelength follows directly.

The de Broglie wavelength connects the particle nature of the electron to its wave nature through $\lambda = h/p$, where $p$ is momentum. In the Bohr model, the electron orbits at specific energy levels, each with a definite velocity and radius—so you'll need to find the electron's momentum at that level using the Bohr radius and the relationship between orbital velocity and the principal quantum number. Once you have momentum, the wavelength follows directly.