The charge on an electron was discovered by:
- J.J. Thomson
- Neil Bohr
- James Chadwick
- Millikan
The Correct Option is A
Solution and Explanation
Top Questions on Discovery of Sub-atomic Particles
- Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is
Given v = frequency of X-ray emitted
Z = atomic number- JEE Main - 2023
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- Which of the following compound does not contain sulphur atom?
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- Which one of the following has unit positive charge and $1$ amu mass?
- Rajasthan PMT - 2006
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- Pick the odd one out:
- JIPMER - 1997
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- The nucleus of an atom consists of
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Questions Asked in Punjab PMET exam
- A wheel is rotating at $ 900\,\,rpm $ about its axis. When the power is cut off it comes to rest in $ 1\min $ . The angular retardation in $ rad/{{s}^{2}} $ is
- Punjab PMET - 2011
- Motion in a plane
- Galileo writes that for angles of projection of a projectile at angles $\left(45^{\circ}+\theta\right)$ and $\left(45^{\circ}-\theta\right)$, the horizontal ranges described by the projectile are in the ratio
- Punjab PMET - 2011
- Motion in a plane
- The potential energy of a weightless spring compressed by a distance a is proportional to
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- Oscillations
- The plane of a dip circle is set in the geographic meridian and the apparent dip is $\delta_1$. It is then set in a vertical plane perpendicular to the geographic meridian. The apparent dip angle is $\delta_2$. The diclination $\theta$ at the plane is
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- the earth's magnetic field
- The wavelength of the first line of Balmer series is $6563\,??. The Rydberg constant for hydrogen is about
Concepts Used:
Discovery of Atom
According to the school textbooks, the man credited by modern science for managing extensive research work on atoms and developing atomic theory goes to an English chemist and physicist John Dalton. However, it might be surprising for many people today but some early records or shreds of evidence show that the concept of atoms was actually formulated much earlier.
The recorded history of the atom started around 450 B.C. with a Greek philosopher commonly known as Democritus. Often, he used to wonder that if a piece of the matter was cut into smaller and smaller portions then the process would get to a point where that matter could not be divided into finer or smaller pieces. He named these indivisible pieces or basic units atoms (uncuttable) which lately translated to the modern term atom.
So the basic idea that matter comprises tiny indivisible particles is actually quite old. It has been existing not only in ancient Greece cultures but in India as well. However, the only reason that these we discredit was because this ancient idea was majorly based on philosophical reasoning rather than scientific reasoning.
Scientifically, John Dalton did revive Democritus’s early ideas about the atom and he organized many experiments that provided evidence for the existence of atoms. Often, he has been referred to as the father of atoms or atomic theory.
Read More: Structure of Atom