physics paper 2A+ level
Explain why the public need not worry that irradiated surgical instruments become
radioactive once sterilized. - ANS-Ionising radiation does not affect the nucleus
Explain what is meant by specific latent heat of fusion. - ANS-energy required to change
1kg of a material from solid to liquid, without changing the temp
The pump can circulate the water at different speeds. When working at higher speeds
the rise in temperature is greater. Explain why. - ANS--When the pump is working faster,
it is doing work on the water-The pump also increases the random motion of water
molecules
Define the electric field strength at a point in an electric field. - ANS--the force per unit
charge on a positive charge at that point
State what is meant by a capacitance of 370μC - ANS-It stores 370μC of charge for
every 1 volt of pd across its plates
Suggest, with a reason, which type of radiation is likely to be the most appropriate for
box the sterilisation of metallic surgical instruments. - ANS-Gamma radiation because it
is the most penetrating
State two possible reasons why the results do not follow the expected inverse-square
law. - ANS-Reason 1- Assumption of no absorption between source & detector
Reason 2- d is not the real distance between source and detector
Explain why there is this imbalance between proton and neutron numbers by referring to
the forces that operate within the nucleus. Your explanation should include the range of
the forces and which particles are affected by the forces. - ANS--5μF affects nucleus
Attraction goes up to 3fm-Repulsion below 1fm-More neutrons needed to hold nucleus
together
The thallium nucleus is formed in an excited state. Electromagnetic radiation box is
emitted from the thallium atom following its formation. Explain the origin and location of
two sources of this radiation. - ANS-Source 1- The excited nucleus emits gamma
radiation
Explain why the public need not worry that irradiated surgical instruments become
radioactive once sterilized. - ANS-Ionising radiation does not affect the nucleus
Explain what is meant by specific latent heat of fusion. - ANS-energy required to change
1kg of a material from solid to liquid, without changing the temp
The pump can circulate the water at different speeds. When working at higher speeds
the rise in temperature is greater. Explain why. - ANS--When the pump is working faster,
it is doing work on the water-The pump also increases the random motion of water
molecules
Define the electric field strength at a point in an electric field. - ANS--the force per unit
charge on a positive charge at that point
State what is meant by a capacitance of 370μC - ANS-It stores 370μC of charge for
every 1 volt of pd across its plates
Suggest, with a reason, which type of radiation is likely to be the most appropriate for
box the sterilisation of metallic surgical instruments. - ANS-Gamma radiation because it
is the most penetrating
State two possible reasons why the results do not follow the expected inverse-square
law. - ANS-Reason 1- Assumption of no absorption between source & detector
Reason 2- d is not the real distance between source and detector
Explain why there is this imbalance between proton and neutron numbers by referring to
the forces that operate within the nucleus. Your explanation should include the range of
the forces and which particles are affected by the forces. - ANS--5μF affects nucleus
Attraction goes up to 3fm-Repulsion below 1fm-More neutrons needed to hold nucleus
together
The thallium nucleus is formed in an excited state. Electromagnetic radiation box is
emitted from the thallium atom following its formation. Explain the origin and location of
two sources of this radiation. - ANS-Source 1- The excited nucleus emits gamma
radiation
