LESSON QUIZIZZ 8.1: DISCOVERY OF RADIOACTIVITY

LESSON QUIZIZZ 8.1: DISCOVERY OF RADIOACTIVITY

What is radioactivity?

Multiple Choice

THINK 1: Radioactivity is the act of emitting radiation spontaneously by an unstable nucleus in an atom.

• TRUE

• FALSE

Multiple Select

THINK 2: Which of the following ARE related to radioactivity?

• Emits radiation

• Involved radioactive substance

• Releases energy

• Not dangerous

Multiple Choice

THINK 3: Radioactive substance is made of atoms.

• TRUE

• FALSE

Multiple Select

THINK 4: Which of the following are the components of sub-atom?

• Nucleus

• Proton

• Neutron

• Electron

• Megatron

Multiple Choice

Radioactive decay is a random and spontaneous process where an unstable nucleus of an atom emits .....................................

• radio wave

• radioactive radiation

• sound wave

• light energy

Multiple Choice

Radioactive decay is the breakdown or fission of an atomic nucleus resulting in the release of energy and matter from the nucleus.

• TRUE

• FALSE

Multiple Choice

Which of the following is NOT the radioactive ray from the nuclear reaction?

• Gamma

• Beta

• Alpha

• Omega

Multiple Choice

What is the nuclear reaction?

• The reaction that occurs in the nucleus of an atom

• The reaction that accurs in the electron area of an atom

Multiple Choice

Name the radioactive ray released together with 2 protons and 2 neutrons from the unstable nucleus of uranium.

• Alpha

• Beta

• Gamma

Multiple Choice

When the nucleus decayed, it releases a high energy electromagnetic photon together with ................................ rays.

• Alpha

• Beta

• Gamma

Multiple Choice

When the nucleus of Thorium is broken down, it releases high energy electrons with ....................... rays.

• Alpha

• Beta

• Gamma

Multiple Choice

Which of the following radioactive rays, has the least ability to penetrate a surface?

• Alpha

• Beta

• Gamma

Multiple Choice

Which of the following radiation could penetrate a lead or concrete wall?

• Alpha

• Gamma

• Beta

Multiple Choice

What is the SI unit for radioactivity?

• Joule per second (J/s)

• Watt (W)

• Becquerel (Bq)

• Curie

Multiple Choice

1 Bq is meant by?

• 1 radioactive decay

• 1 radioactive decay per second

• 1 radioactive ray per minute

Multiple Choice

The time taken for the nuclei (of atoms) to be reduced into half number from the original is known as .............

• half-decay

• half-decompose

• half-life

• half-nucleus

Multiple Choice

What is the symbol for the half-life?

• T_1/2

• S_1/2

• T^1/2

• S^1/2

Multiple Choice

The nuclei of Cobalt-60 which is 100 g will reduce to 50 g for 5.3 years. What is the half-life for Cobalt-60?

• 50 gram

• 100 gram

• 5.3 years

• 60 seconds

Multiple Choice

Based on the graph, what is the remaining percentage mass of plutonium (Pu-239) after 3 half-lives?

• 50%

• 25%

• 12.5%

• 6.25%

Multiple Choice

The time taken for the nuclei (of atoms) to be reduced into half number from the original is known as .............

• half-decay

• half-decompose

• half-life

• half-nucleus

Poll

CONGRATULATIONS! YOU LEARNT ABOUT RADIOACTIVITY. WHAT DO YOU THINK OF THE LESSON?

• Now i know

• I do understand

• Need to repeat

• Need more teacher's guidance