P7 - Radioactivity Flashcards
What is Alpha stopped by?
Paper.
What can Beta go through?
Paper.
Is Gamma more Penetrating than Beta?
Yes.
What are the Three Main Types of Radiation?
Alpha, Beta and Gamma.
Radioactive Sources Emit Alpha, Beta and _______ Rays.
Gamma.
Radioactive Decay is a _________ Event.
Random.
A Radioactive Substance contains ___________ Nuclei that become Stable by Emitting Radiation.
Unstable.
Rutherford used Alpha Particles to Probe Inside _______.
Atoms.
The ‘Plum Pudding’ Model could not explain why some Alpha Particles were ______________ through large Angles.
Scattered.
An Atom has a Small Positively Charged Central _________ where most of the Atom’s Mass is Located.
Nucleus.
The Nuclear Model of the Atom Correctly Explained why some ________ Particles Scattered through Large Angles.
Alpha.
In Alpha and Beta Decay, the Number of ___________ in a Nucleus Changes.
Protons.
The Atomic Number of a Nucleus is the Number of _________ in it.
Protons.
The Mass Number of a __________ is the Number of Protons Plus Neutrons in it.
Nucleus.
Isotopes are Atoms of the same __________ with Different Numbers of Neutrons.
Element.
An Unstable Nucleus becomes more _________ by Emitting an Alpha, Beta or Gamma Particle.
Stable.
What is the Top Number of Alpha?
4.
What is the Bottom Number of Alpha?
2.
What is the Top Number of Beta?
0.
What is the Bottom Number of Beta?
-1.
What is the Top and Bottom Number of Gamma?
0.
What is Beta Stopped by?
A Thin Metal Sheet.
What does Beta Radiation Consist of?
Fast-Moving Electrons.
Beta is less ____________ than Alpha Radiation and more Ionising than Gamma Radiation.
Ionising.
What is Gamma Radiation Stopped by?
Thick Lead.
What does Gamma Radiation consist of?
Electromagnetic Radiation.
Alpha, Beta and Gamma Radiation ________ Substances they pass through.
Ionise.
The Half-Life of a Radioactive Isotope is the Average Time it takes for the Number of ________ of the Isotope in a Sample to have.
Nuclei.
The Number of Atoms a Radioactive __________ and the Count Rate both ____________ by Half every Half-Life.
Isotope…Decrease…
