Cathode rays were first identified by

Question

Accepted Answer

B. {'text': 'Crookes', 'label': 'B'}

1. William Crookes in 1870 discovered cathode rays in a low-pressure discharge tube.
2. In 1879 he suggested they were streams of fast-moving negatively-charged particles.
3. J. J. Thomson later (1897) confirmed and measured e/m of these particles.
4. Roentgen discovered X-rays; Rutherford came later with the nuclear model.
_Source: NCERT Class 12 Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.1_

Answer

{'text': 'Roentgen', 'label': 'A'}

Answer

{'text': 'J. J. Thomson', 'label': 'C'}

Answer

{'text': 'Rutherford', 'label': 'D'}