Same chapter2 marksDifficulty: Easy
Define the half-life of a radioactive substance.
Radioactivity
1 markDifficulty: Easy
An alpha particle is:
- aan electron
- ba helium nucleus
- can electromagnetic wave
- da proton
Original Khojo Papers practice question — not from a past board paper.
Answer
a helium nucleus
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It consists of two protons and two neutrons and carries a charge of +2e.
Related questions
From the same topic and chapter, at a similar level.
Same chapter2 marksDifficulty: Easy
Arrange alpha, beta and gamma radiation in order of increasing penetrating power and of increasing ionising power.
Radioactivity
Same chapter2 marksDifficulty: Easy
Name the three kinds of radiation emitted by radioactive substances and state the nature of each.
Radioactivity
Same chapter2 marksDifficulty: Easy
During beta decay the mass number of the nucleus:
Radioactivity
Same chapter3 marksDifficulty: Medium
A nucleus of atomic number 90 and mass number 234 emits a beta particle. Write the atomic number and mass number of the nucleus formed.
Radioactivity
Same chapter3 marksDifficulty: Medium
A nucleus of atomic number 92 and mass number 238 emits an alpha particle. Write the atomic number and mass number of the nucleus formed.
Radioactivity