Beta particle is actually a _.
Correct answer: A. Fast moving electron
- A. Fast moving electron
- B. Slow moving electron
- C. Eectron at rest
- D. None of these
Explanation
The correct answer is Option A: A beta particle is actually a fast-moving electron. During beta decay, a neutron in a nucleus transforms into a proton, releasing an electron (beta particle) and an antineutrino. This electron is emitted with high velocity, hence the term 'fast-moving'. Option B is incorrect as beta particles are not slow-moving. Option C is incorrect because beta particles are not at rest; they have significant kinetic energy. Option D is incorrect because a beta particle is indeed a fast-moving electron, making 'None of these' an invalid choice.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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