6.1 Radioactive Decay

What is alpha particle?

• A helium nucleus which consist of two neutrons and two protons

• An unstable nucleus decompose into one proton and one electron

• A helium nucleus which consist of two protons and two neutrons

• An unstable nucleus decompose into two protos and two neutrons

What is the charge of Alpha, Beta dan Gamma decay?

• Alpha - Positive

  Beta - Negative

  Gamma - Neutral

• Alpha - Neutral

  Beta - Positive

  Gamma - Negative

• Alpha - Positive

  Beta - Neutral

  Gamma - Negative

• Alpha - Negative

  Beta - Neutral

  Gamma - Positive

Which of the following did not involve in the process of radioactive decay?

• Beta particles

• Electron

• Alpha particle

• Gamma ray

Which of the following statements describe the characteristics of an aplha particle?

• It has a higher penetrating power than a gamma ray

• It has a stronger ionizing power than beta particle

• It has negatively charge

• It is an electromagnetic waves

Figure 1 shows the movement of three radioactive decay, P, Q, and R through electric field. What is P, Q and R?

• P- Alpha Decay

  Q- Beta Decay

  R- Gamma Decay

• P- Beta Decay

  Q- Gamma Decay

  R- Alpha Decay

• P- Beta Decay

  Q- Alpha Decay

  R-Gamma Decay

• P- Gamma Decay

  Q- Beta Decay

  R- Alpha Decay

Gamma penetrating power is

• very low

• low

• medium

• very high

Beta rays can be stopped by ..............

• a piece of paper

• 3 mm of lead

• A few mm of aluminium

• Several cm blocks of lead