Explanation

• Electron: Discovered by J. J. Thomson, 1897

Additional information:

• Proton: Discovered by Ernest Rutherford, 1919
• Neutron: Discovered by James Chadwick, 1932
• Atomic Model Proposed: Plum Pudding Model
• Significance: First subatomic particle discovered

Last updated by NA on 05-11-2026

Explanation

• A Barometer is an instrument used to measure air (atmospheric) pressure.
• It helps in weather forecasting by measuring changes in atmospheric pressure.
• The mercury barometer is the oldest type of barometer.
• It was invented by Evangelista Torricelli in 1643.
• Barometers are widely used in meteorology and aviation.

Last verified on 09-07-2026

Explanation

• Einstein's mass-energy equivalence equation is E = mc².
• E represents energy, m represents mass, and c represents the speed of light in a vacuum.
• The equation shows that mass can be converted into energy and energy into mass.

Last verified on 11-11-2026

Explanation

• Al-Biruni was a famous Muslim mathematician, astronomer, and geographer.
• He calculated the Earth's radius using trigonometric principles and measurements of the angle of dip from a mountain.
• His estimated radius was approximately 6,339.6 km, which was remarkably close to the modern mean radius of about 6,371 km.
• He lived from 973 CE to 1048 CE.

Last verified on 09-11-2026

Explanation

• Sir James Chadwick discovered the neutron in 1932.
• He was a British physicist.
• His discovery completed the basic picture of the atomic nucleus.
• He received the Nobel Prize in Physics in 1935 for this discovery.

Additional information:

• J. J. Thomson – Electron (1897)
• Ernest Rutherford – Atomic nucleus (1911) and Proton (1917)

Last updated by NA on 05-11-2026