An alpha particle is:
Correct answer: A. A helium atom with two electrons removed
- A. A helium atom with two electrons removed
- B. An aggregate of two or more electrons
- C. A hydrogen atom
- D. The ultimate unit of positive charge
Explanation
α-particles are helium nuclei (atom with two electrons removed). The charge on them is +2e while their mass is 4u that is every α-particle has two protons and two neutrons.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Nuclear Physics
Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
Practise Nuclear Physics
1,254 free Nuclear Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Nuclear Physics questions
The half-life of a radioactive isotope is 6.5 hours. If there are initially 48 x 10^32 atoms of this isotope, the number of atoms of this isotope remaining after 26 hours is:
Radioactive 90Sr has a half-life of 30 years. What percent of a sample of 90Sr will remain after 60 years?
Starting with a sample of pure 66Cu, 7/8 of it decays into "Zn" in 15 minutes. The corresponding half-life is:
Radioactive Polonium, 214Po (Z = 84), decays by alpha emission to:
A beta particle is:
A radioactive atom "X" emits a β-particle, thus the resulting atom will be: