IGCSE Physics - Radioactivity and particles

The unit of activity is...

• Becquerel

• Seconds

• Metres

• Sievert

The atomic number indicates how many...are found in the nucleus of an atom.

• Neutrons

• Protons

• Electrons

• Quarks

The most penetrating form of nuclear radiation is...

• alpha

• beta

• gamma

• heat

Which best describes the structure of a beta particle?

• helium nucleus

• slow moving proton

• fast moving electron

• high frequency light wave

What is the half-life of this radioactive substance?

• 5700 years

• 11400 years

• 17100 years

• 22800 years

The overall charge on an alpha particle is...

• -1

• 0

• +1

• +2

The overall charge on a gamma ray is...

• -1

• 0

• +1

• +2

A hydrogen atom has an atomic number of 1, mass number of 1. The first isotope of hydrogen has an atomic number of...

• 0

• 1

• 2

• 3

Atomic decay or the process of radioactivity is a random process.

• True

• False

The most ionising form of nuclear radiation is...

• alpha

• beta

• gamma

• infrared