radioactivity

Question 1

properties of Alpha radiation

Answer 1

helium nucleus
dipositive charge
poor penetrating power
low velocity
strong ionising ability

Question 1

radioactivity

Answer 1

the spontaneous decay of unstable nuclei with the emission of one or more types of radiation

Question 2

beta particles properties

Answer 2

an electron
charge of -1
mass of 1/1840
medium ionising ability
stopped by 5mm of aluminium

Question 3

gamma radiation properties

Answer 3

high energy electromagnetic ray
0 mass and 0 charge
unaffected by electric/magnetic field
travels very fast at speed of light
strong penetrating ability
poor ionising ability

Question 4

half life

Answer 4

the half-life of an element is the time taken for half of the atoms in any sample of the element to decay

Question 5

principle of mass-energy conservation

Answer 5

in a system the total amount of mass and energy is constant but some of the mass is converted to energy according to the equation E=MC2

Question 6

nuclear fission

Answer 6

the splitting of one heavy nucleus into two smaller nuclei of approximately equal mass with the emission of energy

Question 7

nuclear fusion

Answer 7

fusion occurs when two nuclei untie to form a larger nucleus with the emission of energy