Radioactivity

What is radioactivity?

• A type of magnetism

• The spontaneous emission of radiation from an unstable nucleus

• The ability of an object to glow in the dark

Who discovered radioactivity?

• Isaac Newton

• Albert Einstein

• Marie Curie

• Henry Becquerel

Which of the following is not a radioactive element?

• Uranium

• Radium

• Xenon

• Sodium

What is contained in an alpha particle?

• 2 electrons

• protons

• 2 protons

• 2 protons and 2 neutrons

What is the mass of alpha particles?

• 2 amu

• 1 amu

• 4 amu

• 0 amu

Where do the beta particles come from?

• valence shell

• inner shell

• shell closest to nucleus

• the nucleus

Which is not a property of beta particles?

• They can pass through skin

• The penetrate more than alpha particles

• They are inflorescent

• They can ionise a gas they pass through

Speed of gamma radiation is equal to

• speed of sound

• speed of light

• speed of a train

• speed of alpha particles

Ionising power of gamma rays is more than alpha and beta radiations.

• True

• False

Which is a medical use of radioactivity?

• Medical imaging and cancer treatment
• Uses for breaking kidney stones

• Building materials
• Used in echocardiography