Who among the following scientist discovered incandescent light?
Correct Answer : b ) Thomas EdisonExplanation :
Thomas Edison had discovered and invented many things like the invention of carbon rheostat, the discovery of incandescent light, the invention of motion picture camera, the invention of fluorescent electric lamp, the discovery of thermionic emission.
Albert Einstein developed the theory of relativity and made contributions in the development of the theory of quantum mechanics.
Henri Becquerel discovered the radioactivity in uranium.
Marie Curie discovered the elements Polonium and Radium.
Hence, option (b) is correct.