Match List-I with List-II
| List-I | List-II | ||
| Discovery/Hypothesis | Name of the Scientist | ||
| (A) | X-rays | (I) | J J Thomson |
| (B) | Oil drop experiment | (II) | Louis Victor de Broglie |
| (C) | Electron | (III) | Roentgen |
| (D) | Matter displays wave-like properties | (IV) | R A Millikan |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
These are the landmark experiments and ideas that led to the dual nature of radiation and matter.
(A) X-rays — this matches (III) Roentgen. W. C. Roentgen discovered X-rays in 1895.
(B) Oil drop experiment — this matches (IV) R A Millikan. Millikan's oil drop experiment showed that charge is quantised and measured the electronic charge e.
(C) Electron — this matches (I) J J Thomson. Thomson's cathode-ray experiments (1897) measured e/m and established the electron as a particle.
(D) Matter displays wave-like properties — this matches (II) Louis Victor de Broglie. De Broglie proposed that a moving particle has a wavelength \( \lambda = h/p \).
NCERT (2026-27):
Introduction – “… The discovery of X-rays by Roentgen in 1895, and of electron by J. J. Thomson in 1897, were important milestones in the understanding of atomic structure.”
Introduction – “… In 1913, the American physicist R. A. Millikan (1868-1953) performed the pioneering oil-drop experiment for the precise measurement of the charge on an electron.”
Wave Nature of Matter – “… In 1924, the French physicist Louis Victor de Broglie (pronounced as de Broy) (1892-1987) put forward the bold hypothesis that moving particles of matter should display wave-like properties under suitable conditions.”