The nuclear symbol for a beta particle is
The name for the greek letter ẞ is
Of the radiations alpha, beta and gamma,
is the most penetrating and
is the least penetratin
Jenny
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Which of the following characterizes a beta ray?
Choose all that apply.
is more penetrating than a gamma ray
is composed of protons
☐ carries a negative charge
is composed of electrons
☐ is less penetrating than a gamma ray
The Correct Answer and Explanation is :
Answers:
- The nuclear symbol for a beta particle: ( \beta^- ) or ( e^- )
- The name for the Greek letter ẞ: It is called “Beta” (uppercase: Β, lowercase: β).
- Of the radiations alpha, beta, and gamma:
- Gamma rays are the most penetrating.
- Alpha particles are the least penetrating.
- Which of the following characterizes a beta ray? (Correct answers are marked)
- ☒ Carries a negative charge
- ☒ Is composed of electrons
- ☒ Is less penetrating than a gamma ray
Explanation:
Beta particles (( \beta^- )) are high-energy electrons emitted during the process of beta decay, a type of radioactive decay where a neutron in an unstable nucleus converts into a proton, releasing an electron (beta particle) and an antineutrino.
1. Nuclear Symbol and Nature of Beta Particles
The nuclear symbol of a beta particle is either ( \beta^- ) or ( e^- ), representing its identity as a fast-moving electron. Unlike alpha particles (( \alpha )), which consist of two protons and two neutrons, beta particles are much lighter.
2. Greek Letter Beta (ẞ)
The name for the Greek letter ẞ is Beta. In nuclear physics, the lowercase symbol β is commonly used to represent beta particles.
3. Penetrating Power of Radiations
- Gamma rays (( \gamma )) are the most penetrating. They are electromagnetic waves and can pass through several centimeters of lead.
- Beta particles (( \beta^- )) are moderately penetrating and can pass through human skin but are stopped by aluminum.
- Alpha particles (( \alpha )) are the least penetrating and can be stopped by a sheet of paper.
4. Characterization of Beta Rays
- Beta particles carry a negative charge because they are electrons.
- Beta particles are composed of electrons.
- Beta radiation is more penetrating than alpha radiation but less penetrating than gamma radiation.
- Incorrect statements: Beta particles are not composed of protons and are not more penetrating than gamma rays.
This makes beta radiation useful in applications like medical tracers and industrial thickness testing, but also hazardous in high exposure scenarios.