LESSON QUIZIZZ 8.1: DISCOVERY OF RADIOACTIVITY

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

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

THINK 3: Radioactive substance is made of atoms.

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

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

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

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

What is the nuclear reaction?

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

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

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

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

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

What is the SI unit for radioactivity?

1 Bq is meant by?

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

What is the symbol for the half-life?

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?

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

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

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