Radioactive decay and half life

Question 1

True or false?
Decay happens at certain intervals

Answer 1

False decay is random

Question 2

What is activity?

Answer 2

Activity is the overall rate of decay of all radioactive isotopes in the samples

Question 3

What is the unit for activity?

Answer 3

Becquerels (Bq)

Question 4

What is half life?

Answer 4

Time taken for number of radioactive nuclei in a sample to half

Question 5

True or false?
As a radioactive sample decays half life increases

Answer 5

False

Question 6

What is the device used to record radioactive decay?

Answer 6

Geiger - muller tube and counter

Question 7

Radioactive isotope has half life of 10 minutes

If the activity was initially 800Bq,calculate how long it will take for activities for to 50Bq

Answer 7

40 minutes