PHYA5 ~ 20th June 2013 ~ A2 Physics

Reply 800

kingm

10

Original post by bugsuper

Don't forget the Specimen papers which are also available :wink:

Indeed!

Original post by Pinkhead

Here are more questions for you from the old spec for astro (there are like 75 pages of questions).

I have other topics too. If people ask me for them, I will upload them.

Legend man! Thanks a lot for those. Are you doing astro as well? And are those questions a culmination of all of the relevant ones for the new spec or should we still look out for ones that are not relevant?

Original post by Jack93o

theres exam style question for astrophysics? where?

Here

(i'm pretty sure these were on the AQA website, but came across them a while ago).

Exam Style Questions.pdf
Exam Style Questions (Answers).pdf

Reply 801

Pinkhead

14

Original post by kingm

Legend man! Thanks a lot for those. Are you doing astro as well? And are those questions a culmination of all of the relevant ones for the new spec or should we still look out for ones that are not relevant?

I don't do astro but my school gave us these documents and I was told that they are all relevant to the title of the document. I am doing the turning points document now and they all seem to be relevant so I assume that's true for astro too.

Reply 802

kingm

10

Original post by Pinkhead

I don't do astro but my school gave us these documents and I was told that they are all relevant to the title of the document. I am doing the turning points document now and they all seem to be relevant so I assume that's true for astro too.

Good stuff. Really appreciate it because I was worrying about what to do once i'd done the 3 papers, specimen and end of unit stuff. Much obliged.

Reply 803

Jack93o

15

astrophysics related, how would you define 'normal adjustment'?

btw, chromatic aberration affects converging lens, NOT cassegrain reflecting telescope, right?

(edited 10 years ago)

Reply 804

bugsuper

8

Original post by Jack93o

astrophysics related, how would you define 'normal adjustment'?

btw, chromatic aberration affects converging lens, NOT cassegrain reflecting telescope, right?

I don't think you get chromatic aberration with a reflecting telescope, no.

Normal adjustment is when the telescope length is the sum of the focal lengths of the objective and eyepiece lenses, when they have the same focus, and when the image is formed at infinity

Reply 805

amish123

Original post by Lucy-1995

What paper was this question from, or was this the whole question? I can't figure out where you got any of the numbers from on the first line of your equation?!

'390.406 + 1.675 - (149.357 + 239.056 + 2x1.675)' why is that so??

Really confused! I hate all the mass defect/binding energy questions with a passion :frown:

The information was provided in the question, don't fret. In the exam, all the nuclei masses will be given to you :smile:

Reply 806

Jack93o

15

Original post by bugsuper

I don't think you get chromatic aberration with a reflecting telescope, no.

Normal adjustment is when the telescope length is the sum of the focal lengths of the objective and eyepiece lenses, when they have the same focus, and when the image is formed at infinity

nice and concise :biggrin:

Reply 807

cooldudeman

18

In terms of section 9, what exactly is a stable isotope?

Posted from TSR Mobile

Reply 808

Pinkhead

14

Original post by cooldudeman

In terms of section 9, what exactly is a stable isotope?

Posted from TSR Mobile

One that does not undergo radioactive decay.

Reply 809

mrwho

Original post by mrwho

Okay, so this is quite a simple question really for applied physics. The one thing I don't get is why for the final question, you are supposed to halve it because 'each two revolutions produce 350J'. How does the area signify two revolutions, and why does the indicated power use two revolutions instead of one?

Could someone help?

Reply 810

cooldudeman

18

What do we need to know about electron diffraction and nuclear density???

Posted from TSR Mobile

Reply 811

jarasta

12

Original post by mrwho

Could someone help?

Input power is the power you get from the fuel, which is the calorific value * rate of fuel flow
Indicated work per cycle is the work done per cycle, which is just the area of the loop. What the enging should give you ideally, you really wont have your output=the indicated workdone usually though.
Indicated power is the power produced by the whole cycle, the formula for this is on the formula sheet, its something like. Area of the loop*number of cylinders*rotations per second

(edited 10 years ago)

Reply 812

ladynova

16

Just a quick question, can a virtual image only be formed when it image appears before the object? Because the definition says "a virtual image is formed where the light rays appear to come from a different point in space"

Reply 813

posthumus

20

A little help here guys please :smile:

I keep getting half the value for 1st one... also what exactly is r0 & R ? Difference ? :smile:

Thanks in advance!

Reply 814

Pinkhead

14

Original post by posthumus

A little help here guys please :smile:

I keep getting half the value for 1st one... also what exactly is r0 & R ? Difference ? :smile:

Thanks in advance!

R is the radius, r0 is a constant.

For the first one, did they give you the mass of a gold nucleus? If not, you'd have to work out the mas yourself by adding up proton and neutron masses, then dividing that by 4/3pi r^3.

(Mass comes to around 3.27x10^-25)

Reply 815

Bobilina

12

Well this can't go as bad as Unit 4 did for me both in January and on Thursday. Plus i quite like the turning points section, minus relativity.

Reply 816

cooldudeman

18

Original post by Bobilina

Well this can't go as bad as Unit 4 did for me both in January and on Thursday. Plus i quite like the turning points section, minus relativity.

I hate the light topic. I hate huguan

Posted from TSR Mobile

Reply 817

Pinkhead

14

Original post by cooldudeman

I hate the light topic. I hate huguan

Posted from TSR Mobile

*huygens

Reply 818

bugsuper

8

Original post by ladynova

Just a quick question, can a virtual image only be formed when it image appears before the object? Because the definition says "a virtual image is formed where the light rays appear to come from a different point in space"

I'm pretty sure that's right. Virtual images only exist because the eye "traces back" the light rays which appear to come from some distance behind the actual object.

http://www.leydenscience.org/physics/electmag/image_des.htm

Reply 819

smith50

6

Original post by posthumus

A little help here guys please :smile:

I keep getting half the value for 1st one... also what exactly is r0 & R ? Difference ? :smile:

Thanks in advance!

Okay so find the value of ro which is a constant so is the same for all nuclides.
For the next part us the equation density = mass/volume where the volume is the volume of a sphere and the value of r will be the constant you found out i part a).So it is safe to say that the density of thh nucleus is constant and independent of it's radius.So what i am trying to say is that R is the radius of the specific nuclide and r0 is a constant value same for all nuclides.
Hope this makes sense :smile:

Smith

PHYA5 ~ 20th June 2013 ~ A2 Physics

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