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Which of the following pairs of physical phenomenon and the discoverer is/are correctly matched? 1. James Chadwick: Photoelectric effect 2. Albert Einstein: Neutron 3. Marie Curie : Radium Select the correct answer using the code given below :

Options

  1. A1,2 and 3
  2. B1 and 2 only
  3. C2 and 3 only
  4. D3 only

Correct answer

D. 3 only

Step-by-step solution

Marie Curie discovered polonium and radium in 1898. In 1903 they won the Nobel Prize for Physics for discovering radioactivity. In 1911 she won the Nobel Prize for Chemistry for isolating pure radium. By 1920, physicists knew that most of the mass of the atom was located in a nucleus at its center, and that this central core contained protons. In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. Albert Einstein is best known for his equation E = mc

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