2016 AQA Physics Unit 1 - Unofficial Mark scheme Watch

Ahahah191
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#421
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#421
(Original post by simigrewall)
For the similarities of microwaves and infrared can you say they have high frequencies and short wavelengths? ☺️
Same. Is that correct?
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Poppingcandy
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#422
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#422
I swear the fins reduce surface area so less heat is lost
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redsoules
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#423
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(Original post by Poppingcandy)
I swear the fins reduce surface area so less heat is lost
SA is calculated by taking the area of each individual segment of a shape... so the surface area of a cube is 6 times one of the sides squared. Hence fins increase SA.
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DanIsWatchingYT
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#424
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#424
22 was the change in temperature (the omega symbol) and the starting temp was 100 so you had to take 22 from 100
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1235678901234
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The two question about nuclear were:
'Why will France still use it?'
And
'Give 2 advantages of nuclear power stations'

There was nothing about disadvantages was there?
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sarah400001
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#426
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(Original post by charliej2802)
Did anyone else put 22 degrees, think i messed it up
I put 22 degrees
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sheima derdour
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#427
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#427
(Original post by charliej2802)
Did anyone else put 22 degrees, think i messed it up
i put 22 degrees
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redsoules
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#428
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#428
If you put 22 degrees put your hands up :bhangra::bhangra::bhangra:
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Lovearmy
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#429
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#429
(Original post by ihatehannah)
Completed mark scheme, hope it's clear and a good indication of what you got in the exam, good luck!
1. Frequency ( 1)

2. Echoes (1)

3. spread out, same as (2)

b) vibrations are parallel to the direction of energy transfer (2)

4. Expensive as National Grid is a long distance away from rural areas (1)

4b) ADVANTAGES
constant supply, little variation in output
£30k cheaper than wind turbine
renewable resource
doesn't produce as much noise as wind
No CO2

DISADVANTAGES
could ruin ecosystem by preventing free movement of fish
May need maintenance unlike wind
Lower power output - 8W compared to 10W

Wind - ADVANTAGES
higher average output
Needs little maintenance
renewable resource
Easily expanded
No CO2

DISADVANTAGES
Eyesore
noise pollution
Wind speeds vary, meaning there could be times of under- or oversupply
Costs 50k, 30k more than HEP (6)

5. inefficient as less or little energy used to heat food as heat is lost as infrared radiation to the surroundings(2)

uses of infrared(1) : remote controls, optical fibres

uses of microwaves(1): mobile phones, satellites

b) properties of microwaves and infra red radiation (2): can diffract, can refract, travel same speed in vaccuum, both transverse waves, can be reflected transverse• same speed (through air)• can be reflected• can be refracted• can be diffracted• can be absorbed• transfer energy• can travel through a vacuum• can be polarised• show interference

calculation questions, 340 m/s for first one (2) then 78 degrees(3) , then 6.4 watts(2) then 0.07 degrees/s (2) efficiency question was 0.48 W (2)


6. Fins increase surface area and black matt a are good absorbers of heat (2)

7. cosmic microwave background radiation (1)

b) provides evidence for the big bang theory (1)


10. They keep costs as low as possible as efficiency does not increase as much but the cost goes up rapidly , ( give example and data figures to secure the marks) (2)


11. why france will still use nuclear power(2) : cost of electricity is cheaper(1) and produces much more electricity(1) , produces no greenhouse gases like co2(1)

12. Disadvantages of nuclear power stations(2): raw materials are non- renewable, high decommissioning costs, produces radioactive waste. Risk of nuclear disasters.

13. factors that affect rate of energy transfer of mug(2): room temperature, surface area , how shiny it is( not sure about this one) and colour of the mug

b) particles gain kinetic energy and collide more frequently, passing on their extra kinetic energy to other particles .(2)


c) how is a convection current formed in the mug(4): liquid at the bottom is heated and particles gain kinetic energy and move away from each other, this makes the liquid less dense , causing it to rise and displace the denser colder liquid at the top , the denser particles then fall and is heated again.


14) control variable for the investigation measuring rate of evaporation (1) : same beaker or same type of beaker, same position in the room., same thermometer .

b) why is the data logger better(2): more accurate (1) , easier to read(1) , more precise (1) avoids human error (1)

15 relationship of the graph comparing 3 types of beakers and their rate of evaporation(1): as time increases, rate of evaporation decreases.

b) Beaker A(1) gradient of the line is the lowest and the final temperature is the highest of em all

c) If investigation was repeated with lower volume , what effect would it have(1) : rate of evaporation will be higher (1)

Why evaporation causes temperature to decrease (3): particles with enough kinetic energy and travelling in the right direction will escape the liquid and evaporate and take their kinetic energy with them , which means average kinetic energy of particles in liquid is lower and thus temperature is lower.

16) why a vacuum reduces energy transfer (2) : no particles so stops energy transfer by conduction , convection.
Well to be honest according to your markscheme i got about 56 so what great could i get for that
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redsoules
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#430
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(Original post by archiiii)
Well to be honest according to your markscheme i got about 56 so what great could i get for that
Hmm... Well lets think buddy. 56/60, could that be a C? Or maybe that is a B?

You say you got 56 but you cannot even use basic logic to conclude where on the spectrum that lies. 56/60... Isn't that pretty obviously going to be an A*?

I'm using logic to infer that because you have asked such a stupid question, that you really just wanted everyone to know how well you did.
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Just_sayin
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#431
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#431
b) properties of microwaves and infra red radiation (2): can diffract, can refract, travel same speed in vaccuum, both transverse waves, can be reflected transverse• same speed (through air)• can be reflected• can be refracted• can be diffracted• can be absorbed• transfer energy• can travel through a vacuum• can be polarised• show interference

I put both were longitudinal waves. That ok or?
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redsoules
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(Original post by Just_sayin)
b) properties of microwaves and infra red radiation (2): can diffract, can refract, travel same speed in vaccuum, both transverse waves, can be reflected transverse• same speed (through air)• can be reflected• can be refracted• can be diffracted• can be absorbed• transfer energy• can travel through a vacuum• can be polarised• show interference

I put both were longitudinal waves. That ok or?
They are not longitudinal. They are both Transverse. Longitudinal is a sound wave or P wave.

You might get one mark then if you put someone else on the first point.
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Lovearmy
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#433
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(Original post by redsoules)
If you put 22 degrees put your hands up :bhangra::bhangra::bhangra:
Hahaha i got 28 so i m bit close to you 😀😀😀
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Lovearmy
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(Original post by redsoules)
Hmm... Well lets think buddy. 56/60, could that be a C? Or maybe that is a B?

You say you got 56 but you cannot even use basic logic to conclude where on the spectrum that lies. 56/60... Isn't that pretty obviously going to be an A*?

I'm using logic to infer that because you have asked such a stupid question, that you really just wanted everyone to know how well you did.
Well to be honest i did not want everyone to know how good i did but that was just for fun but i think u really got angry with that😡😡
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redsoules
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(Original post by archiiii)
Well to be honest i did not want everyone to know how good i did but that was just for fun but i think u really got angry with that😡😡
It annoys me how smart some people can be, and then literally the next second prove to be a complete tool.

But still, I'm pretty certain that the only reason people do this is to gain attention/credit.

If I score a fantastic goal in a football match, I know how good that is, but I go to a team mate and ask "was that a good goal?" he'd probably knock me out.
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ProbablyJade
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#436
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(Original post by 1235678901234)
The two question about nuclear were:
'Why will France still use it?'
And
'Give 2 advantages of nuclear power stations'

There was nothing about disadvantages was there?
No the questions asked for disadvantages of nuclear fuels
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Krish235
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#437
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#437
(Original post by tianshan)
For the disadvantages of nuclear power stations, would I get the mark if I said "They carry risks of a major catastrophe, since nuclear fuels are involved"?
yes
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Krish235
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#438
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#438
(Original post by strongcurrent)
I really do hope so!! I want an A!
48/49 is definitely an A*!!
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Linrose
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#439
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Yoo Helllo guys,
btw if you get like 3 B's and like an A* for your ISA(controlled assessment) what do you think the overall grade would be??
or 2B'S and an A and A* for ISA(controlled assessment)

Thanks
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Mahrez
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#440
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#440
(Original post by Linrose)
Yoo Helllo guys,
btw if you get like 3 B's and like an A* for your ISA(controlled assessment) what do you think the overall grade would be??
or 2B'S and an A and A* for ISA(controlled assessment)

Thanks
High B/ low A depending on precentage you got in exam for ISA amnd wether the grade was a low B or a high one
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