Radioactive Materials | MCQs

Explanation

Question: A powder contains 100mg of a radioactive material that emits α-particles. The half-cycle of the isotope is five days. The mass of isotope that remains after ten days will be?

Answer: The half-life of the isotope is 5 days, which means that every 5 days, half of the remaining material decays. After 10 days, there will be two half-lives:

1. First half-life (5 days): 100mg → 50mg (half of the material decays)
2. Second half-life (next 5 days): 50mg → 25mg (half of theq remaining material decays)

So, after 10 days, 25mg of the original 100mg will remain.

Explanation

An artificial radioactive element can be made by bombarding high energy particles on stable elements.

This process can induce radioactivity in the stable element.

This resulting in the formation of a new radioactive isotope.

Explanation

The unit of the decay constant is s⁻¹.

It represents the probability per second that a nucleus will decay.

It indicating how quickly a radioactive substance undergoes decay.