- (a) Proton
- (b) Neutron
- (c) Nucleus
- (d) Electron
_______ is considered the largest glacier of Pakistan.
March 18, 2026
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- (A) Siachen Glacier
- (B) Tirich Mir Glacier
- (C) Biafo Glacier
- (D) Hispar Glacier
James Chadwick is known for his discovery of:
James Chadwick is known for his discovery of:
- James Chadwick, a British physicist and student of Ernest Rutherford, is well-known for discovering the neutron in 1932. Chadwick bombarded beryllium atoms with alpha particles. This method released highly penetrating radiation that was not affected by electric or magnetic fields, showing it had no electrical charge. This discovery completed the basic atomic model, which includes protons, neutrons, and electrons. It also explained why atomic mass is often greater than atomic number. For this work, he received the Nobel Prize in Physics in 1935.
- (a) Proton: The proton was discovered by Ernest Rutherford in 1917 (named in 1920) through experiments involving the bombardment of nitrogen with alpha particles.
- (c) Nucleus: The atomic nucleus was discovered by Ernest Rutherford in 1911 following his famous gold foil experiment.
- (d) Electron: The electron was discovered by J.J. Thomson in 1897 while he was studying the properties of cathode rays.
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