Half Life Measurement MCQ (Multiple Choice Questions) PDF Download

If a C-14 has a half-life of 5730 years, then how long will it take for the number of C-14 in a sample to drop to 1/8 of initial quantity?

1. 2.58 × 10⁴ years
2. 1.44 × 10⁴ years
3. 1.72 × 10⁴ years
4. 2.58 × 10⁴ years

If a radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute, then how long will it take for the count rate to drop to 125 per minutes

1. 120 minutes
2. 90 minutes
3. 30 minutes
4. 60 minutes

What fraction of the original sample will be after 22 years, if the Cobalt-50 is a radioactive element with a half-life of 4.3 years?

1. 1 ⁄ 32
2. 1 ⁄ 16
3. 1 ⁄ 8
4. 1 ⁄ 4

If the activity of a sample of radioactive bismuth decreases to 1/8 of its original activity in 15 days, then the sample's half-life will be

1. 3 days
2. 10 days
3. 5 days
4. 7 days

Radium-226 has a half-life of

1. 1160 years
2. 1340 years
3. 1580 years
4. 1620 years