1. The problem statement, all variables and given/known data Earth has the mass 6 · 10^24 kg and the orbit radius r = 1.5 · 10^11 m. (a) Compute its de Broglie wavelength. (b) Apply de Broglie quantization condition as in the case of the Hydrogen atom and compute the quantum number n for the orbit of Earth. (c) What is the difference between the radius of nth and n + 1th orbit? 2. Relevant equations lamba=h/p=h/mv 3. The attempt at a solution I am using the above equation to solve this but im stuck at getting the velocity of earth. I am completely stumped.