1) What is the thinnest material that can mostly stop a 0.5 MeV beta particle? a

Question

1) What is the thinnest material that can mostly stop a 0.5 MeV beta particle?
a. A sheet of notebook paper

b. A 1 cm thick aluminum plate    

c. A 1 m thick concrete wall

2) What is the thinnest material that can completely stop a 0.5 MeV gamma ray?
a. A sheet of notebook paper

b. A 1 cm thick aluminum plate    

c. A 1 m thick concrete wall

3) What is the thinnest material that can mostly stop a 0.5 MeV alpha particle?
a. A sheet of notebook paper

b. A 1 cm thick aluminum plate    

c. A 1 m thick concrete wall

Would appreciate any help! Will rate w/in 24 hrs based on correctness & explanation!

Explanation / Answer

1) B

2) C

3) A

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