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Unedit.. leelee plz help check n edit..=), electron collides with light changes uncertainty principle - cannot measure initial position and velocity at the same time, Max Planck Black bodies Radiates energy, For atomic line spectra certain frequencies of light are observed Inferences , Atoms combine in whole number ratios Features *atom are tiny *atoms are indestructable *atoms are hard *atoms are spherical, Bohr Observation For atomic line spectra certain frequencies of light are observed, most αlpha particles go through the gold foil undeflected but small fraction undergo major & minor deflections Inferences *major & minor deflection are the result of the alpha particle encountering a concentrate positive on its path through the atom *since most alpha particles go through undeflected they are travelling through ''empty space'' inside the atom, *major & minor deflection are the result of the alpha particle encountering a concentrate positive on its path through the atom *since most alpha particles go through undeflected they are travelling through ''empty space'' inside the atom Features *small,dense,positive mass *electron orbit the nucleas *mostly empty space, electrons velocity changes uncertainty principle - cannot measure initial position and velocity at the same time, Hisenberg pridict electrons behaviour accurately and precisely, need to know electrons velocity, Radiates energy Light Hisenberg