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AQA A LEVEL PHYSICS PAPER 2 WITH
100% CORRECT ANSWERS
what is meant by specific heat capacity - correct answersthe energy needed to raise the
temperature of 1kg of material by 1C.
define avogadro's constant - correct answersthe number of atoms in 12g of carbon 12 (OR the no.
of particles/atoms in one mole of a substance)
define the specific latent heat of vaporisation of water - correct answersthe energy required to
change the state of a unit mass of water to gas (1) without a change in temperature (1)
features of an ideal gas (3) - correct answers- collisions are elastic
- molecules have negligible volume
- gas obeys ideal gas law (Boyles law)
assumptions made in the molecular kinetic theory of an ideal gas - correct answers- all molecules
are identical
- molecules in random motion
- newtonian mechanics apply
- vol of gas molecules negligible (compared to vol of gas)
- collisions are elastic
state and explain what happens to the speed of molecules in a gas when the temperature increases
- correct answersthe average/mean speed of molecules increases (1) as mean ke proportional to
absolute temp
state what is meant by an elastic collision - correct answersa collision in which ke is conserved
two different gases at the same temp have molecules with different mean square speeds. explain
how this is possible - correct answersmasses are different (1) but because ke same, mean square
speeds must be different
why does the total ke of an ideal gas equal the total internal energy of an ideal gas - correct
answersmolecules have no potential energy (1) no elastic collisions occur
Explain what is meant by the binding energy of a nucleus - correct answersthe energy required to
split up the nucleus (1) into individual nucleons (1)
3 sources of background radiation - correct answersRocks (1)
the sun (1)
cosmic rays (1)
What is meant by the decay constant? - correct answersprobability of decay per unit time
AQA A LEVEL PHYSICS PAPER 2 WITH
100% CORRECT ANSWERS
what is meant by specific heat capacity - correct answersthe energy needed to raise the
temperature of 1kg of material by 1C.
define avogadro's constant - correct answersthe number of atoms in 12g of carbon 12 (OR the no.
of particles/atoms in one mole of a substance)
define the specific latent heat of vaporisation of water - correct answersthe energy required to
change the state of a unit mass of water to gas (1) without a change in temperature (1)
features of an ideal gas (3) - correct answers- collisions are elastic
- molecules have negligible volume
- gas obeys ideal gas law (Boyles law)
assumptions made in the molecular kinetic theory of an ideal gas - correct answers- all molecules
are identical
- molecules in random motion
- newtonian mechanics apply
- vol of gas molecules negligible (compared to vol of gas)
- collisions are elastic
state and explain what happens to the speed of molecules in a gas when the temperature increases
- correct answersthe average/mean speed of molecules increases (1) as mean ke proportional to
absolute temp
state what is meant by an elastic collision - correct answersa collision in which ke is conserved
two different gases at the same temp have molecules with different mean square speeds. explain
how this is possible - correct answersmasses are different (1) but because ke same, mean square
speeds must be different
why does the total ke of an ideal gas equal the total internal energy of an ideal gas - correct
answersmolecules have no potential energy (1) no elastic collisions occur
Explain what is meant by the binding energy of a nucleus - correct answersthe energy required to
split up the nucleus (1) into individual nucleons (1)
3 sources of background radiation - correct answersRocks (1)
the sun (1)
cosmic rays (1)
What is meant by the decay constant? - correct answersprobability of decay per unit time
