Henri Becquerel's Discovery: Radioactivity
Henri Becquerel is renowned for a pivotal discovery in physics.
Key Discovery
- In 1896, Henri Becquerel accidentally discovered radioactivity.
- He observed that uranium salts emitted rays that could penetrate opaque materials and expose photographic plates, even in the dark.
- This phenomenon, termed "Becquerel rays" initially, was later named radioactivity by Marie Curie.
Other Options Analysis
- Infrared radiation was discovered by William Herschel.
- Ultraviolet light was discovered by Johann Wilhelm Ritter.
- X-Rays were discovered by Wilhelm Conrad Roentgen.
Therefore, Henri Becquerel discovered Radioactivity.
Similar Questions
- Which of the following is used as a fissionable fuel in a nuclear reactor?
- The amount of radiation being emitted by a radioactive material is measured using the conventional unit _________.
- Which of the following is used in the treatment of cancer?
- What is the SI unit of radioactivity?
Through which process is the energy of the Sun generated?
Important Questions from Radioactivity
- The energies of the 3 lowest states of an atom are E 0 = −14 eV, E 1 = −9 eV and E 2 = −7 eV. The Einstein coefficients are A 10 = 3 × 10 8 s −1 , A 20 = 1.2 × 10 8 s −1 and A 21 = 8 × 10 7 s −1 . If a large number of atoms are in the energy level E 2 , the mean radiative lifetime of this excited state is
The nuclei of 137 Cs decay by the emission of β - particles with a half life of 30.08 years. The activity (in units of disintegrations per second or Bq) of a 1 mg source of 137 Cs, prepared on January 1, 1980, as measured on January 1, 2021 is closest to
The Q - value of the α - decay of 232 Th to the ground state of 228 Ra is 4082 keV. The maximum possible kinetic energy of the α - particle is closest to
Radioactivity is the characteristic of which of the following?
A free neutron decays spontaneously into a proton, an electron and ___________ .
