Question

Which of the following statements are true?
Enter all the correct items, e.g., enter AD. If none is correct, enter N:

1. The uncertainty of the average counts-per-minute is always about 1 count per minute.
2. β^- radiation is equivalent to an electron expelled from an atomic nucleus.
3. Background counts can be significant if the distance between the source and the Geiger counter is large.
4. γ radiation readily penetrates lead (Pb) foil.

Answer 1

ANSWER:

options B and D

γ radiation consists of high energy photons but not protons

β- radiation includes electrons

the geiger counter detects radiation not only from the cesium source.