nuclei - A radioactive substance contains unstable _______ that become stable by emitting radiation (6)., gamma - The three main types of radiation are alpha, beta, and _____ (5)., random - Radioactive decay is a ______ event - you cannot predict or influence when it will happen (6)., geiger - a ______ counter detects radioactivity (6)., nucleus - An atom has a small positively charged central _______ where most of the atom's mass is located (7)., protons - In alpha decay, a nucleus loses 2 _______ and 2 neutrons (7)., beta - In which type of radioactive decay is an electron created in the nucleus and instantly emitted? (4)., alpha - This type of radiation has the greatest ionising power (5)., halflife - The average time is takes for the number of nuclei in a sample of radioactive isotopes to halve (4,4)., decreases - The count rate of a Geiger counter caused by a radioactive source _________ as the activity of the source decreases (9)., displacement - ____________ is distance in a given direction (12)., vector - A ______ quantity is a physical quantity that has magnitude and direction (6)., scalar - A ______ quantity has magnitude but no direction (6)., newton - The unit of force (6)., contact - A _______ force is a force that acts on objects only when the objects touch each other (7)., opposite - When two objects interact, they always exert equal and _________ forces on each other (8)., resultant - The _________ force is a single force that has the same effect as all the forces acting on an object (9)., drag - The opposing force to thrust (4)., lift - The opposing force to weight (4), balanced - Newton's first law of motion states that if the forces acting on an object are ________, the resultant force on the object is zero (8).,

P7 & P8

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