LC Chemistry Radioactivity

Which scientist is credited for being the first to discove radioactivity

• Henri Becquerel

• Marie and Pierre Curie

• Neils Bohr

• Geiger and Muller

Radioactivity is

• The breakup of an atom with the emission of Alpha, beta and gamma radiation

• When an unstable nucleus breaks down and emits radiation

• The spontaneous breaking up of an unstable nucleus with the emission of one or more types of radiation

• The spontaneous breaking up of an unstable atomwith the emission of one or more types of radiation

The three types of radiation are:

• Alpha, beta and Gamma

• Alpha, Beta and Kappa

• Helium, electrons and Gamma

• Alpha, beta and Delta

Beta particles are:

• Fast moving electrons emitted from the nucleus

• Electrons released from an atom

• Helium nuclei

• A type of electromagnetic radiation

Alpha particles are:

select all that apply

• Helium nuclei emitted from an unstable nucleus

• Two protons and two neutrons emitted from an unstable nucleus

• Fast moving electrons emitted from an unstable nucleus

• The least penetrating type of radiation

• The most penetrating type of radiation

is the most penetrating type of radiation:

• Alpha

• Beta

• Gamma

• Delta

is the least penetrating type of radiation:

• Alpha

• Beta

• Gamma

• Delta

Alpha radiation can be stopped by:

Select all that apply

• 5mm of aluminium

• 20mm of lead

• A sheet of paper

• A few centimeters of air

Which of the following are attracted to the positive plate in an electric field?

• Alpha particles

• Beta particles

• Gamma rays

• All of the above

Which of the following are attracted to the negative plate in an electric field?

• Alpha particles

• Beta particles

• Gamma rays

• All of the above