Radioactivity

Name the first person who discovered the Xray

• Wilhelm Conrad Roentgen

• Marie Curie

• Antoine Henri Becquerel

Name the first person who discovered radioactive radiation

• Marie Curie

• Wilhelm Conrad Roentgen

• Antoine Henri Becquerel

What is the unit of radioactivity

(Choose two)

• Joule

• Curie

• becquerel

• Newton

Radioactive radiation consists of:

• Alpha ray

• Beta ray

• Gamma ray

• Delta ray

Which of the following is a radioactive element?

• Sodium

• Potassium

• Uranium

• Calcium

If the half-life of substance Q is 20 minutes, what is the remaining mass after 60 minutes if its original mass is 32g?

• 32g

• 16g

• 8g

• 4g