half life & nuclear fission

Question 1

what is half life?

Answer 1

time taken for half of the nuclei to decay

Question 2

how do you work out count rate?

Answer 2

keep halving the original count rate by how long it takes to half life until you get to the time to decay count. then you count the amount of times you divided

e.g 6000 –> 3000 –> 1500 –> 750 –> 375
8 hours in total

Question 3

how do you find the half life on a graph?

Answer 3

half the no. on the side and draw a line until you hit the line on the graph and draw down

Question 4

where is nuclear fission used?

Answer 4

in power stations

Question 5

what are the 2 examples of nuclear fuel

Answer 5

uranium or plutonium

Question 6

explain what happens in nuclear fission

Answer 6

neutron ▶️ fired at large uranium or plutonium nuclei ▶️ nuclei splits in 2(fission) ▶️ 2 smaller nuclei are created ▶️ ENERGY ▶️ three neutrons are then created

Question 7

alpha decay is when an ……. is lost

Answer 7

alpha particle

Question 8

beta decay is when an ……… is lost

Answer 8

electron

Question 9

what is nuclear fission?

Answer 9

splitting of an atomic nucleus, resulting in release of large energy amounts

Question 10

what was Otto Hahns idea?

Answer 10

discovered enormous amounts of energy can be kept from nuclear fission

Question 11

what was Daltons idea

Answer 11

• atoms cannot be made or broken

- all matter is made from tiny atoms

Question 12

draw what happens in nuclear fusion

Answer 12

look at phone