10.2 lesson radioactivity

Multiple Choice

What is NOT found in an alpha particle?

• Protons

• Neutrons

• Electrons

Multiple Choice

An atom with an atomic number of 100 undergoes Beta decay. What is its new atomic number?

• still 100

• 101

• 99

• 98

Multiple Choice

You are standing behind a block of wood. What kind of radiation will this NOT stop?

• Alpha radiation

• Beta radiation

• Gamma radiation

Multiple Choice

You have 50 grams of a radioactive substance. After 2 hours, only 12.5 grams remain. What is the half-life of this substance?

• 30 minutes

• 1 hour

• 2 hours

• 4 hours