Physics – 5.2.1 Detection of radioactivity | e-Consult

A student is investigating the radioactivity of different brands of luminous watch dials. They measure the count rate of a Geiger-Muller tube over a period of 5 minutes for each brand. The results are shown in the table below:

Brand A: 250 counts/minute

Brand B: 310 counts/minute

Brand C: 280 counts/minute

Calculate the relative activity of Brand B compared to Brand A. Show your working.