For a particle in a ring, the energy levels can be expressed as En=h^2/2m(n/L)^2, where n=0, +-1, +-2,., L=2pir is the circumference of the ring, and...

For a particle in a ring, the energy levels can be expressed as En=h^2/2m(n/L)^2, where n=0, +-1, +-2,..., L=2pir is the circumference of the ring, and r is the radius of the ring. If r=4.0*10^-10m, find the energy and the corresponding wavelength () for n=0 to n=1 transition.