Help finding de Broglie wavelength for an electron

[reality99]

Homework Statement

An electron in the first Bohr orbit of a hydrogen atom (a_0=5.3*10^-11m) has a KE of 13.6 eV. Express the de Broglie wavelength for this electron in multiples of the atomic circumference.

Homework Equations

lambda=h/p
=h/(sqrt(2mqV)

The Attempt at a Solution

I honestly don't even really know how to get started. I believe these are the relative equations but combining the Bohr model and de Broglie wavelengths has me stumped. Any help on the correct equations to use or how to start this is greatly appreciated.

 

[graphene]

You've been given the energy.
Use it to find momentum.
& then calculate wavelength from the momentum.