What phenomenon led neils bohr to his model of the atom and what assumption did he make in his modelr? 6) when scientists were trying to understand the blackbody radiation process a) what problem did plank solve in understanding the process? 7) how did debroglie justify bohr's assumption in his model of the atom? 8) what does a negative value indicate in geometric optics regarding the a) magnification of a lens or mirror? b) focal length for a lens? 9) describe briefly the three ways electromagnetic waves can interact with matter a) c) b) 10) derive and explain the equation for destructive interference from diffraction of multiple slita.