The half-life of a radioactive substance is 10 days. How many days will it take to disintegrate 3/4 of its initial value?
20 days
The decay formula follows the half-life rule:
After 1 half-life (10 days) → 1/2 of the substance remains.
After 2 half-lives (20 days) → 1/4 of the substance remains, meaning 3/4 has disintegrated.
Thus, the correct answer is (c) 20 days.
Important Questions from Nuclei
Which of the following is an example of nuclear fusion?
The half-life of a radioactive substance is 10 days. How many days will it take to disintegrate 3/4 of its initial value?
If a matchbox of size 5 cm × 4 cm × 1 cm is filled with nuclear matter, what will be its expected mass? The density of nuclear matter is approximately 2.3 × 1017 kg m-3.
Which of the following is an example of nuclear fusion?
If a matchbox of size 5 cm × 4 cm × 1 cm is filled with nuclear matter, what will be its expected mass? The density of nuclear matter is approximately 2.3 × 1017 kg m-3.
