IB Physics-Qc#5- Theme E-background radiation-May 2022-Paper 2

Note:
Mass number= A= N+Z ( number of protons+ number of neutrons ). Atomic number (Z)= number of protons
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.
Outline how the count rate was corrected for background radiation.
a.
When a single piece of thin copper foil is placed between the source and detector, the count rate is 810 count minute−1. The foil is replaced with one that has three times the thickness. Estimate the new count rate.
b.
Further results were obtained in this experiment with copper and lead absorbers
comment on the radiation detected from this radioactive source.
c.
Another radioactive source consists of a nuclide of caesium that decays to barium
Write down the reaction for this decay.

Topic 7 Atomic and nuclear physics Playlist

[ib-physics-exams]

Mass number= A= N+Z ( number of protons+ number of neutrons ). Atomic number (Z)= number of protons

[gottem]

Could you please share the presentation you showed at 5:55 ?