WorksheetsHalf life
Total questions: 8
Worksheet time: 4mins
Tick the boxes which are a correct unit for Activity
s
/s
Bq
J
Which is a good definition for half life?
Time for half of the atoms to change to another element
Time taken for half of the radioactive atoms to disappear
Time taken for the activity of a sample to fall to one half of its initial value
The half life of a sample is 5 days. How many half lives have passed in a period of 15 days?
1
2
3
4
The half life of a sample is 2 hours. The initial activity is 4000Bq. What is the activity after 6 hours?
1000Bq
500Bq
250Bq
I have no idea!
What is the half life of this sample?
2 mins
3 mins
4 mins
4 hours
Which graph has the shortest half life?
red
green
dark blue
light blue
A samples activity will fall from 10,000Bq to 1250 Bq in 12 years. What is the half life of the sample?
1 year
3 years
4 years
12 years
Tick the boxes which are true
Half lives can be affected by temperature
Half lives can not be changed at all by any physical variations
Radioactive decay is random
A radioactive isotope ca emit alpha and beta at the same time
