DP Physics (last assessment 2024)
Question 22M.2.SL.TZ2.c
| Date | May 2022 | Marks available | [Maximum mark: 4] | Reference code | 22M.2.SL.TZ2.c |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Comment | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 4]
22M.2.SL.TZ2.c
An experiment is carried out to determine the count rate, corrected for background radiation, when different thicknesses of copper are placed between a radioactive source and a detector. The graph shows the variation of corrected count rate with copper thickness.
Further results were obtained in this experiment with copper and lead absorbers.
Comment on the radiation detected from this radioactive source.
[4]
Markscheme
lead better absorber than copper ✓
not alpha ✓
as it does not go through the foil / it is easily stopped / it is stopped by paper ✓
there is gamma ✓
as it goes through lead ✓
ALTERNATIVE 1
can be beta ✓
as it is attenuated by «thin» metal / can go through «thin» metal ✓
ALTERNATIVE 2
not beta ✓
it is stopped by «thin» metal ✓
