Radioactivity

Question 1

What is the order of the Electromagnetic spectrum?(from long to short wavelength)

Answer 1

radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays.

Question 2

what are the ionising types of radiation?

Answer 2

Beta minus , Beta plus , Alpha, Gamma, x ray, UV

Question 3

how ionising and penetrating is alpha radiation?

Answer 3

most ionising and least penetration

Question 4

How ionising and penetrating is Beta - radiation?

Answer 4

quite penetrating but not as much as gamma, more ionising than gamma but less than alpha

Question 5

How ionising and penetrating is gamma radiation?

Answer 5

Most penetrating, not very ionising

Question 6

short soundwaves =

Answer 6

higher pitch

Question 7

red shift =

Answer 7

the further the lines have shifted, the faster the star is moving
red = away
blue= towards

Question 8

big bang theory =

Answer 8

there was a single point of energy which caused an explosion - background radiation in the form of microwaves - and the universe is still expanding

Question 9

steady state theory =

Answer 9

the universe has always existed and it’s expanding (new matter is being created)

Question 10

what happens in a beta - nucleus?

Answer 10

neutron turns into a proton and fires an electron , charge of -1

Question 11

beta plus and beta minus atomic mass number changes

Answer 11

beta plus decreases by one
beta minus increases by one

Question 12

what is a tracer?

Answer 12

radioactive substances that are put into patients. Doctors can use a special camera to find out where the tracers are inside a patient, to help them to diagnose cancers or other diseases.

Question 13

stages of fission

Answer 13

1. neutrons fired at unstable nucleus
2. 2 daughter nuclei neutrons emitted
3. moderator to slow down (graphite water)
4. allows chain reaction
5. control rods of boron absorb neutrons
6. lower = stop
   7.split heat water steam turn turbine