[blackjenny85]

for 3b) i wrote that when there is low demand for electricity (mostly at night) the water from the lower reservoir gets pumped up to the higher reservoir where it is stored (by a gate) until there is pick up time and more electricity is required... something along those lines how many marks would that give me?

[RohanV]

If you write the origin of the CMBR was the big bang would that get a mark

[blackjenny85]

for 5a) i wrote that : it has a lower u-value so less heat is lost but i also talked about how there is a vacuum between the two panes of glass which would restrict condensation as there are no particles? would that get marks?

[shibucool]

(Original post by Dalek1099)
I don't think the eye was were you put it on the exam and the principles of that video are still roughly the same,whether the mirror is tilted or not.

The eye was there were I put and it is correct and the virtual image corresponds to the light rays of the eye, it's just titled in a way to trick us. Also you can see the original image is laterally inverted but in the opposite side.

[Crystallouise99]

(Original post by popburrow)
Yes that would be accepted. Other reasons such as the surface area of the stove increased the rate of energy tranfer.

Can you just put matt black is a good absorber of infrared radiation and therefore transfers energy at a faster rate ???

[jgarnham]

Was there not a question describing condensation and the change in state of a gas into a liquid? I don't think I can see it in this mark scheme.

[StudyScience98]

My answer to 7 (b) was that for diffraction to be at it's 'most' the wavelength of that wave must be of a similar size to the gap. Since the one with a larger WL is 'similar' to the gap, there will be more diffraction.
Q9 Luckily I've revisied CMBR in a hope it would be on there. Basically, for the origin I wrote the big bang (starting point of the universe)
For the wavelength question, it will increase. So far after observations, scientists KNOW that the wavelength of CMBR has increased since the 'big bang' and so if the big bang theory is correct, it will continue to do so. As the universe expands outwards, the radiation will spread out.

[popburrow]

(Original post by blackjenny85)
for 3b) i wrote that when there is low demand for electricity (mostly at night) the water from the lower reservoir gets pumped up to the higher reservoir where it is stored (by a gate) until there is pick up time and more electricity is required... something along those lines how many marks would that give me?

This is exactly what I wrote. It will definitley get you 2-3/3 marks!

[popburrow]

(Original post by StudyScience98)
My answer to 7 (b) was that for diffraction to be at it's 'most' the wavelength of that wave must be of a similar size to the gap. Since the one with a larger WL is 'similar' to the gap, there will be more diffraction.
Q9 Luckily I've revisied CMBR in a hope it would be on there. Basically, for the origin I wrote the big bang (starting point of the universe)
For the wavelength question, it will increase. So far after observations, scientists KNOW that the wavelength of CMBR has increased since the 'big bang' and so if the big bang theory is correct, it will continue to do so. As the universe expands outwards, the radiation will spread out.

7b: It was nothing to do with a similar gap because there was only one obstacle. You will still get the marks but the answer is as shown above in the mark scheme!

[popburrow]

(Original post by jgarnham)
Was there not a question describing condensation and the change in state of a gas into a liquid? I don't think I can see it in this mark scheme.

Thanks for noticing that! I'll add it to the updated mark scheme!

[popburrow]

Unofficial mark scheme: (Not in order - I am missing some questions but the total amount of questions listed below is worth around 50 marks). If there are any corrections, please say so and we'll discuss them.

1)
a) The stove emits radiation very well as it is a dark matt surface. This emmission can only happen if the surface absorbs hence, black matt is also a good absorber.
b) Efficiency = 90% or equivilent.
c) Wasted energy could be chemical,light,sound or heat(to stove).
d) environmental advantages of stove:less fossil fuels burnt,less C02,global warming and less S02,acid rain and the C02 is used up,by the wood when it grew to compensate for the C02 produced when burnt.

2)
a) Graph interpretation: As the load in newtons increases, the amount of input energy also increases. The energy input increases constantly.
b) Energy transfer was 2 550 000J
c) The motor uses gravitational potential energy or kinetic.
d) Wasted energy is dissipated into the surroundings and heats the surroundings.

3)
a) Pumping cold water beneath the Earth's atmosphere where there are hot rocks. These hot rocks are used to heat up the water, turn it into steam and used to turn a turbine to generate electricity.
b) Energy is saved when the water is pumped and stored in dams so that energy can be used for future demands. Storage also allows fast production of energy when there is an unexpected surge.
c) - 6 MARK QUESTION

Offshore wind turbines
Advantages: Less pollutant gases and therefore makes Britain enviormentally friendly. It is also a renewable energy resource.
Disadvantages: Could effect many habitats such as animals (Birds). The reliabilty of the wind turbines for producing electricity is not very high.

Undersea National grid
Advantages: Not effected badly in bad weather. The electricity gained could be used to reduce fossil fuels,C02,Global warming,S02,acid rain etc.More Hydroelectric electricity will allow more pump storage systems,allowing the national grid to be able to compensate for variations in demand of electricuty better.
Disadvantages: Expensive as waterproof casing will be needed. It could also effect many sea creatures such as fish and other.

4)
a) Metals have free delocalised electrons which can help transfer energy through out the metal when they gain energy from the heat source. Particles also vibrate which increases the spread of energy throughout the metal.
b) (Not sure where this question goes so I just slipped it in here!) Gas particles have high amounts of kinetic energy. When they come in contact with a cold surface or an obstacle, the gas loses energy and the particles contract which means they become more closer together. This means the particles have less energy and the gas eventually turns into a liquid.

5)
a) Double glazing has a lower U-Value meaning that less energy is transferred to the outside of the window and thus less condensation occurs because condensation is accelerated,with a higher surface temperature.
b) The U-Values for the double glazed windows was much more higher which makes them more effective at reducing heat transfer and acting as an insulator rather than the single glazed window. The double glazed companies are more expensive than the single glazed but they are still more effective.

6)
a) Light rays drawn and reflected from bulb onto mirror,at two points,angle i=angle r and the 4 lines extend into the mirror until two of the lines cross,in the eyes perspective range, and then the virtual light bulb must then be same distance in front as behind the mirror.
b) It is a virtual image because it isn't generated by real light rays.
7) a)Microwaves and radiowaves have similar properties (Large wavelength, smaller frequency) and travel through a vaccum.
b) The signal from the radiowaves will be better than terrestrial waves because radiowaves can diffract more and therefore, spread more so that the signal can be picked up. Terrestrial waves on the other hand diffract but not enough for the signal will to be picked up.
c) Microwaves can pass through the Earth's atmosphere and to the sattelites in space.
d) Frequency = 1,200,000 Hz

8) a) 2880p - Escalator one.

9)a)Red shift is the increase in wavelength due to galaxy's moving further away from Earth. The big bang theory claims that the universe started with an explosion which caused expansion. Therefore, the planets are moving away from us.
b) After the big bang, high levels of CMBR were found in space which can be used as evidence to help prove the big bang theory.
c)The origin was the small initial point of matter
d)lLarger wavelengths as the universe was exanding and therefore, more radiation would spread out.

[popburrow]

(Original post by jgarnham)
Was there not a question describing condensation and the change in state of a gas into a liquid? I don't think I can see it in this mark scheme.

Scroll down to the bottom for the updated mark scheme. Check out question 4(b)!

[08rbut]

Oh My Goodness. I must have failed.

[popburrow]

(Original post by 08rbut)
Oh My Goodness. I must have failed.

This is unofficial. Even we don't know the answers, we're just guessing! This is the closest we could get to the mark scheme it self.

[Dalek1099]

(Original post by popburrow)
This is unofficial. Even we don't know the answers, we're just guessing! This is the closest we could get to the mark scheme it self.

Your answer to condensation is slightly wrong,particles can't contract and you should also mention the heat is absorbed by the colder surface.

[Ciaranissocool]

Wow I think I got really similar answers on mine WOOOH. Does anyone have any idea about a possible grade boundary for an A*. I was thinking it would be about 46-48 as it seemed easier than January 2012 which had a grade boundary of 44 for an A*

[Dalek1099]

(Original post by Ciaranissocool)
Wow I think I got really similar answers on mine WOOOH. Does anyone have any idea about a possible grade boundary for an A*. I was thinking it would be about 46-48 as it seemed easier than January 2012 which had a grade boundary of 44 for an A*

I'm thinking 45.

[popburrow]

(Original post by Dalek1099)
Your answer to condensation is slightly wrong,particles can't contract and you should also mention the heat is absorbed by the colder surface.

I meant the matter contracts.

[Dalek1099]

(Original post by popburrow)
I meant the matter contracts.

I know and thats why the unofficial mark scheme needs changing.

[popburrow]

(Original post by Dalek1099)
I know and thats why the unofficial mark scheme needs changing.

I'll update it mate! You know the missing questions?