# UNOFFICIAL MARKSCHEME!~AQA GCSE Physics Unit 2 25th Janurary NEW SPEC Watch

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#121

(Original post by

Here is a little Radiation question!

If one litre of milk contaminated with iodine-131 gives a count rate of 400 counts/second, how long will it take for the count rate to fall to 25 counts/second? Half life of Iodine-131 is 8 DAYS!

Would appreciate if someone asked me a hard question btw!

**lolface32**)Here is a little Radiation question!

If one litre of milk contaminated with iodine-131 gives a count rate of 400 counts/second, how long will it take for the count rate to fall to 25 counts/second? Half life of Iodine-131 is 8 DAYS!

Would appreciate if someone asked me a hard question btw!

How long would it take for the count rate to fall to 35.5counts/second?

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#122

(Original post by

32 days

**Dalek1099**)32 days

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#123

Does anybody know where I can find the mark scheme for the Physics Unit 2 paper in June 2012???

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#124

(Original post by

Well done! Can you ask me a tough question please, this forum is dead, it is only at like 9 where people will start flooding in !

**lolface32**)Well done! Can you ask me a tough question please, this forum is dead, it is only at like 9 where people will start flooding in !

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#125

Question:

A small, radio-controlled flying toy is hovering in the air. It has a weight of 0.6 Newtons (N) and the fan is pushing 1.5 kg of air downwards every 10 seconds.

Calculate the velocity at which the toy is hovering.

EQUATIONS:

MOMENTUM = MASS x VELOCITY

FORCE = CHANGE IN MOMENTUM/TIME TAKEN

A small, radio-controlled flying toy is hovering in the air. It has a weight of 0.6 Newtons (N) and the fan is pushing 1.5 kg of air downwards every 10 seconds.

Calculate the velocity at which the toy is hovering.

EQUATIONS:

MOMENTUM = MASS x VELOCITY

FORCE = CHANGE IN MOMENTUM/TIME TAKEN

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#126

Can anyone help me with this question..? I really don't get it :/

Plutonium-239 has a half-life of 24,200 years and decays into uranium-235 with a half-life of 703 million years.

A sample of plutonium-239 of mass 0.8kg is being stored. How many years will pass before the sample contains 0.7kg of uranium-235? Show clearly how you work out your answer.

And as for the 6 mark questions I think that there's a possibility of maybe like explaining the Rutherfords experiment and his conclusions.. Just a guess :/

Plutonium-239 has a half-life of 24,200 years and decays into uranium-235 with a half-life of 703 million years.

A sample of plutonium-239 of mass 0.8kg is being stored. How many years will pass before the sample contains 0.7kg of uranium-235? Show clearly how you work out your answer.

**(3marks)**And as for the 6 mark questions I think that there's a possibility of maybe like explaining the Rutherfords experiment and his conclusions.. Just a guess :/

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#127

(Original post by

Question:

A small, radio-controlled flying toy is hovering in the air. It has a weight of 0.6 Newtons (N) and the fan is pushing 1.5 kg of air downwards every 10 seconds.

Calculate the velocity at which the toy is hovering.

EQUATIONS:

MOMENTUM = MASS x VELOCITY

FORCE = CHANGE IN MOMENTUM/TIME TAKEN

**bbadonde2**)Question:

A small, radio-controlled flying toy is hovering in the air. It has a weight of 0.6 Newtons (N) and the fan is pushing 1.5 kg of air downwards every 10 seconds.

Calculate the velocity at which the toy is hovering.

EQUATIONS:

MOMENTUM = MASS x VELOCITY

FORCE = CHANGE IN MOMENTUM/TIME TAKEN

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#128

**bbadonde2**)

Question:

A small, radio-controlled flying toy is hovering in the air. It has a weight of 0.6 Newtons (N) and the fan is pushing 1.5 kg of air downwards every 10 seconds.

Calculate the velocity at which the toy is hovering.

EQUATIONS:

MOMENTUM = MASS x VELOCITY

FORCE = CHANGE IN MOMENTUM/TIME TAKEN

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#129

(Original post by

You don't need to know this btw

**Efemena15**)You don't need to know this btw

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#130

(Original post by

Can anyone help me with this question..? I really don't get it :/

Plutonium-239 has a half-life of 24,200 years and decays into uranium-235 with a half-life of 703 million years.

A sample of plutonium-239 of mass 0.8kg is being stored. How many years will pass before the sample contains 0.7kg of uranium-235? Show clearly how you work out your answer.

And as for the 6 mark questions I think that there's a possibility of maybe like explaining the Rutherfords experiment and his conclusions.. Just a guess :/

**Arshii**)Can anyone help me with this question..? I really don't get it :/

Plutonium-239 has a half-life of 24,200 years and decays into uranium-235 with a half-life of 703 million years.

A sample of plutonium-239 of mass 0.8kg is being stored. How many years will pass before the sample contains 0.7kg of uranium-235? Show clearly how you work out your answer.

**(3marks)**And as for the 6 mark questions I think that there's a possibility of maybe like explaining the Rutherfords experiment and his conclusions.. Just a guess :/

then after another 24,200 years the o.4 kg of plutonium becomes 0.2kg of pluto and 0.2 of U (so now there is 0.6kg of U )

can you do the last step now ?

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#131

(Original post by

every 24,200 the mass of plutonium halves and that must turn into unranium 235 because of alpha decay so after 24,200 years there will be o.4 kg of plutonium and 0.4kg of uranium

then after another 24,200 years the o.4 kg of plutonium becomes 0.2kg of pluto and 0.2 of U (so now there is 0.6kg of U )

can you do the last step now ?

**techno836**)every 24,200 the mass of plutonium halves and that must turn into unranium 235 because of alpha decay so after 24,200 years there will be o.4 kg of plutonium and 0.4kg of uranium

then after another 24,200 years the o.4 kg of plutonium becomes 0.2kg of pluto and 0.2 of U (so now there is 0.6kg of U )

can you do the last step now ?

0.1kg of plutonium...

0.7kg of uranium...?

There are 3 halve lives so, 24200*3 = 72600 years...?

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#132

(Original post by

No you do, why would you not need to know? Besides, it is not hard at all!

**lolface32**)No you do, why would you not need to know? Besides, it is not hard at all!

http://www.sciencelab.org.uk/gcses/p...ts-changed.php

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#133

(Original post by

If you click on "what's changed" for p2, it says relationship between force, change in momentum and time

http://www.sciencelab.org.uk/gcses/p...ts-changed.php

**Efemena15**)If you click on "what's changed" for p2, it says relationship between force, change in momentum and time

http://www.sciencelab.org.uk/gcses/p...ts-changed.php

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#134

(Original post by

Does anybody know where I can find the mark scheme for the Physics Unit 2 paper in June 2012???

**AnbarH**)Does anybody know where I can find the mark scheme for the Physics Unit 2 paper in June 2012???

Here's the mark scheme for June 2012 Physics 2 Higher Paper - new spec

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#135

(Original post by

-Nuclear Fission& Fusion

- Uses of Radiation

- Forces in Action

-Car safety( I doubt it though)

-Stars (Doubt this to)

**lolface32**)-Nuclear Fission& Fusion

- Uses of Radiation

- Forces in Action

-Car safety( I doubt it though)

-Stars (Doubt this to)

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#136

(Original post by

So you halve it again....

0.1kg of plutonium...

0.7kg of uranium...?

There are 3 halve lives so, 24200*3 = 72600 years...?

**Arshii**)So you halve it again....

0.1kg of plutonium...

0.7kg of uranium...?

There are 3 halve lives so, 24200*3 = 72600 years...?

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#138

(Original post by

I have a feeling that the 6 marker will be on the advantages and disadvantages on RCCB and fuses

**V.M**)I have a feeling that the 6 marker will be on the advantages and disadvantages on RCCB and fuses

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#139

(Original post by

AQA-PH2HP-W-MS-Jun12.pdf

Here's the mark scheme for June 2012 Physics 2 Higher Paper - new spec

**Arshii**)AQA-PH2HP-W-MS-Jun12.pdf

Here's the mark scheme for June 2012 Physics 2 Higher Paper - new spec

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#140

**V.M**)

I have a feeling that the 6 marker will be on the advantages and disadvantages on RCCB and fuses

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