These are the answers i got for nuclear, they;re not all right but if we edit the post we can make a markscheme 1a) Alpha radiation (1) 1b) 0.05m and 1m (2) 1bii) Gamma radiation obeys inverse square law (1) 1c) Inhaling the source. Outside the body it cannot penetrate through skin but inside it can damage cell membranes and cause mutation (2)
2ai) Electrostatic repulsion (1) 2aii) Charge on isotope nucleus remains the same so the effect is the same (1) 2b) 1.4 x 10^-15 2bii) 5 x 10^-15 2c) 1.4 x 10^17 kg/m^3
3a) added on a beta minus decay and an antineutrino 3b) 3.4 x 10^-6 3bii) 2.4 x 10^17 3ci) 2 or 3 fast moving neutrons are released when a uranium nucleus decays. These go onto be absorbed by other uranium nuclei causing further fission and so a chain reaction. 3cii) Slows the fast moving nuclei by giving KE to water atoms so they can be absorbed for fission 3cii) The walls absorb radiation causing excitation of atoms in the wall and thus radiation is given off
4a) Takes 130J of energy to raise the temp of 1kg of lead by 1K without change of state 4b) 47000J 4c) 6 marker
5a) Molecules move in constant rapid motion, all collisions are elastic
Thats all the ones i wrote down
And for 2c) it said show that it's approximately 1.4 but I got 1.3
These are the answers i got for nuclear, they;re not all right but if we edit the post we can make a markscheme 1a) Alpha radiation (1) 1b) 0.05m and 1m (2) 1bii) Gamma radiation obeys inverse square law (1) 1c) Inhaling the source. Outside the body it cannot penetrate through skin but inside it can damage cell membranes and cause mutation (2)
2ai) Electrostatic repulsion (1) 2aii) Charge on isotope nucleus remains the same so the effect is the same (1) 2b) 1.4 x 10^-15 2bii) 5 x 10^-15 2c) 1.4 x 10^17 kg/m^3
3a) added on a beta minus decay and an antineutrino 3b) 3.4 x 10^-6 3bii) 2.4 x 10^17 3ci) 2 or 3 fast moving neutrons are released when a uranium nucleus decays. These go onto be absorbed by other uranium nuclei causing further fission and so a chain reaction. 3cii) Slows the fast moving nuclei by giving KE to water atoms so they can be absorbed for fission 3cii) The walls absorb radiation causing excitation of atoms in the wall and thus radiation is given off
4a) Takes 130J of energy to raise the temp of 1kg of lead by 1K without change of state 4b) 47000J 4c) 6 marker
5a) Molecules move in constant rapid motion, all collisions are elastic
Thats all the ones i wrote down
For 3b) I got .3 instead of .4 For 3bii) 8.2*10-11 😱😱
These are the answers i got for nuclear, they;re not all right but if we edit the post we can make a markscheme 1a) Alpha radiation (1) 1b) 0.05m and 1m (2) 1bii) Gamma radiation obeys inverse square law (1) 1c) Inhaling the source. Outside the body it cannot penetrate through skin but inside it can damage cell membranes and cause mutation (2)
2ai) Electrostatic repulsion (1) 2aii) Charge on isotope nucleus remains the same so the effect is the same (1) 2b) 1.4 x 10^-15 2bii) 5 x 10^-15 2c) 1.4 x 10^17 kg/m^3
3a) added on a beta minus decay and an antineutrino 3b) 3.4 x 10^-6 3bii) 2.4 x 10^17 3ci) 2 or 3 fast moving neutrons are released when a uranium nucleus decays. These go onto be absorbed by other uranium nuclei causing further fission and so a chain reaction. 3cii) Slows the fast moving nuclei by giving KE to water atoms so they can be absorbed for fission 3cii) The walls absorb radiation causing excitation of atoms in the wall and thus radiation is given off
4a) Takes 130J of energy to raise the temp of 1kg of lead by 1K without change of state 4b) 47000J 4c) 6 marker
5a) Molecules move in constant rapid motion, all collisions are elastic
Thats all the ones i wrote down
I can't quite remember all my answers but those all look pretty much the same as what I put.
I can't quite remember all my answers but those all look pretty much the same as what I put.
For the ones where it said "show that it is close to this", for the follow up questions where it required use of that value, do you use the value you calculated or do you use the one that they said in the question?
For the ones where it said "show that it is close to this", for the follow up questions where it required use of that value, do you use the value you calculated or do you use the one that they said in the question?
These are the answers i got for nuclear, they;re not all right but if we edit the post we can make a markscheme 1a) Alpha radiation (1) 1b) 0.05m and 1m (2) 1bii) Gamma radiation obeys inverse square law (1) 1c) Inhaling the source. Outside the body it cannot penetrate through skin but inside it can damage cell membranes and cause mutation (2)
2ai) Electrostatic repulsion (1) 2aii) Charge on isotope nucleus remains the same so the effect is the same (1) 2b) 1.4 x 10^-15 2bii) 5 x 10^-15 2c) 1.4 x 10^17 kg/m^3
3a) added on a beta minus decay and an antineutrino 3b) 3.4 x 10^-6 3bii) 2.4 x 10^17 3ci) 2 or 3 fast moving neutrons are released when a uranium nucleus decays. These go onto be absorbed by other uranium nuclei causing further fission and so a chain reaction. 3cii) Slows the fast moving nuclei by giving KE to water atoms so they can be absorbed for fission 3cii) The walls absorb radiation causing excitation of atoms in the wall and thus radiation is given off
4a) Takes 130J of energy to raise the temp of 1kg of lead by 1K without change of state 4b) 47000J 4c) 6 marker
5a) Molecules move in constant rapid motion, all collisions are elastic
Thats all the ones i wrote down
2)a)ii) was two marks I think too
I'm sure for the one about the core walls, in past exams you've had to mention that they absorb the neutrons-I put that and that it absorbs the other energy
I'm sure for the one about the core walls, in past exams you've had to mention that they absorb the neutrons-I put that and that it absorbs the other energy
Nope, it was only 1 mark cus I remembering thinking about how much I should write.
These are the answers i got for nuclear, they;re not all right but if we edit the post we can make a markscheme 1a) Alpha radiation (1) 1b) 0.05m and 1m (2) 1bii) Gamma radiation obeys inverse square law (1) 1c) Inhaling the source. Outside the body it cannot penetrate through skin but inside it can damage cell membranes and cause mutation (2)
2ai) Electrostatic repulsion (1) 2aii) Charge on isotope nucleus remains the same so the effect is the same (1) 2b) 1.4 x 10^-15 2bii) 5 x 10^-15 2c) 1.4 x 10^17 kg/m^3
3a) added on a beta minus decay and an antineutrino 3b) 3.4 x 10^-6 3bii) 2.4 x 10^17 3ci) 2 or 3 fast moving neutrons are released when a uranium nucleus decays. These go onto be absorbed by other uranium nuclei causing further fission and so a chain reaction. 3cii) Slows the fast moving nuclei by giving KE to water atoms so they can be absorbed for fission 3cii) The walls absorb radiation causing excitation of atoms in the wall and thus radiation is given off
4a) Takes 130J of energy to raise the temp of 1kg of lead by 1K without change of state 4b) 47000J 4c) 6 marker
5a) Molecules move in constant rapid motion, all collisions are elastic
Thats all the ones i wrote down
Thanks for that. Do people have any different answers? Let's make a mark scheme for section A at least. And can someone confirm if the marks are all correct?
For 2a I got electromagnetic, but I think that would get marks as well What was 2b and 2bii? I remember getting 1.3 as well but I used the value I worked out not the one they give.
Thanks for that. Do people have any different answers? Let's make a mark scheme for section A at least. And can someone confirm if the marks are all correct?
For 2a I got electromagnetic, but I think that would get marks as well What was 2b and 2bii? I remember getting 1.3 as well but I used the value I worked out not the one they give.
2bi and 2bii were both show that questions I think: 2bi show that r0is roughly 1.4*10^-15 and 2bii show that 51V had a nuclear radius of 5*10^-15
Oh yeah I got them, but I remember I got 1.33 or something for r0
For the moderator I wrote about a control rod instead, said keeps reaction under control by releasing 1 neutron per fission.
For the moderator I put that kinetic energy from neutrons is transferred to thermal energy in the moderator due to aournd 50 collisions-I'd seen that somewhere in a similar question on a past paper
For the moderator I put that kinetic energy from neutrons is transferred to thermal energy in the moderator due to aournd 50 collisions-I'd seen that somewhere in a similar question on a past paper
That should be right
do you know how many marks the last few questions were?
Thanks for that. Do people have any different answers? Let's make a mark scheme for section A at least. And can someone confirm if the marks are all correct?
For 2a I got electromagnetic, but I think that would get marks as well What was 2b and 2bii? I remember getting 1.3 as well but I used the value I worked out not the one they give.
I can confirm that he is correct on all those. Does anyone need a summary of the six marker?