Rutherford bombarded _________________ particles in discovery of nucleus?
Correct answer: B. Alpha-rays
- A. Gamma-rays
- B. Alpha-rays
- C. Beta-rays
- D. X-rays
Explanation
Rutherford used alpha particles, which are positively charged helium nuclei, in the gold-foil experiment that revealed the small, dense atomic nucleus. Beta particles are electrons or positrons, whereas gamma rays and X-rays are electromagnetic radiation. The likely mistake is choosing X-rays because they are also used to investigate atomic structure.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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