Radioactivity — practice question

As illustrated, two radiation beams, P and Q, move into an electric field. Which types of radiation are P and Q?

• AP: beta ($\beta$), Q: alpha ($\alpha$)
• BP: beta ($\beta$), Q: gamma ($\gamma$)
• CP: gamma ($\gamma$), Q: alpha ($\alpha$)
• DP: gamma ($\gamma$), Q: gamma ($\gamma$)