5. A hydrogen atom initially at the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of the photon. 6. (a) Using Bohr’s model calculates ...

Photo: Niels Bohr's research notes for his new atomic ... He realized that Rutherford's model wasn't quite right. By all rules of classical physics, it should be very unstable.