Match the column A and column B and mark the correct option.        Column A      Column B 1. Photoelectric effect A. de Broglie 2. Wave-particle duality B. Roentgen 3. X-rays C. R. A. Millikan 4. Quantized electric charge D. Heinrich Hertz

1-D, 2-A, 3-B, 4-C 1-A, 2-D, 3-B, 4-C 1-D, 2-A, 3-C, 4-B 1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-B, 4-C

Photoelectric effect was discovered by Heinrich Hertz,  wave-particle duality was discovered by de Broglie, X-rays was discovered by Roentgen and Millikan's experiment established the quantized electric charge.