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Notes for Physics exam
Last minute revise
Calculating with pressure, the temperature has to be in Kelvin!!
Beta minus- Neutron changes into a Proton
o Atomic number increases by 1 and mass stays the same
o Down quark changes to Up quark
o Above "Line of Stability"
Beta plus- Proton changes into a Neutron
o Atomic number decreases by 1 and mass stays the same
o Up quark changes to Down quark
o Below "Line of Stability"
Gamma ray- Release of Energy
Alpha radiation- Releases 2 Protons and 2 Neutrons
o Atomic number decreases by 2 and mass number decreases by 4
o At top right of graph or on the end of "Line of stability"
BMR-Minimum energy to stay alive (not including exercise)
o Factors that affect it
Age Younger, higher BMR
Muscle More muscle higher BMR (even at rest)
Fat More fat higher BMR (not as much as muscle)
Gender Boys have more muscle and higher BMR
Temperature of external Colder environment BMR increases to keep
ECG shows "Action Potential"
o P is Atria contraction
o QRS is ventricle contraction
o T is ventricle relaxation
Intensity if move twice as far from source you get 1/4 of radiation.
Thermal Neutrons are low energy neutrons
In nuclear reactions Uranium can only absorb "Thermal Neutrons"
Remember additional formula not given in exam;