8.1 Discovery of Radioactivity

The scientist that was involved in discovered polonium and radium :

• Wilhelm Conrad Roentgen

• Antoine Henri Becquerel

• Marie Curie

• James Watson

The first person who discovered the X-ray is Antoine Henri Becquerel.

• TRUE

• FALSE

Antoine Henri Becquerel is a scientist who was discovered

• uranium which is a radioactive compound

• radioactive radiation through ionising power

• X-ray through photography

• radium and polonium and introduced the terms of radioactive.

Radioactivity is the spontaneous decaying process for a stable nucleus by emitting radioactive radiation.

• TRUE

• FALSE

Mark the unit for radioactivity

• Curie, Ci

• Sievert, Sv

• Roentgen, R

• Becquerel, Bq

State the three examples of radioactive radiation.

• Alpha

• Iodine

• Beta

• Cobalt

• Gamma

Radioactive decay is influenced by temperature, pressure and humidity.

• TRUE

• FALSE

Unstable atoms will become stable atoms after undergoing decay and releasing radioactive radiation.

• TRUE

• FALSE

When radioactive substances decays the number of decaying nucleus will___________,whereas the number of nucleus that have not decayed____________.

• decrease, increase

• increase, no change

• increase, decrease

• no change, decrease

The number of nucleus of radioactive substance is the same before and after decay.

• TRUE

• FALSE