Explanation

(d) In 1905, Einstein explainedthe phenomenon of photoelectric effect on the basis of Planck’s quantum theory. According to which light travels in the form of small bundles or packets of energy called quanta or photons. Newton’s corpuscular theory explained, the rectilinear propagation of light. Wave nature of light was used to explain the interference effect of light. Bohr’s gave a detailed theory explaining the structure of atom.