GCSE OCR 21st Century Triple Science (CBP1-7) Thread

Heheh..;w;..I thought a white dwarf star was colder...Heheh..Back to the revision book T-T -dead.-

XDDDDDDDD

Heheh..;w;..I thought a white dwarf star was colder...Heheh..Back to the revision book T-T -dead.-

XDDDDDDDD

6 marker predictions?

Not really been right, apart from 2/3 on P123 but I'll give it a go:

Cycle of stars
Economic/social questions on observatories
Explaining sun, stars and moon times/rotation ---> someone mentioned this one today
OR, instead of the above question - lunar eclipses, since solar came up in June 2013.

You camt write alot on lunar eclipses tho can ya?

Apparently you can write a lot on solar eclipses, so I guess you could for lunar! They'd probably include why are they rare, how do they occur and outline briefly why are they different to solar.

Not really been right, apart from 2/3 on P123 but I'll give it a go:

Cycle of stars
Economic/social questions on observatories
Explaining sun, stars and moon times/rotation ---> someone mentioned this one today
OR, instead of the above question - lunar eclipses, since solar came up in June 2013.

Does anyone have any links to past papers? c:
Or is their a page on this forum where the links are lurking? XDD

Has anyone got a better definition of "parallax angle"? CGPs is kind of badly worded IMO - "The parallax angle is half the angle moved against distant background stars over 6 months."

Basically you know how the earth moves due to the orbit? That means in each 6 months (through a year) you are at different places on the orbit of Earth. Because of this, you view the stars differently as you are looking at them from different angles. In order to find the parallax angle you simply find the stars location in the first six months, then find the stars location in the next six months. The lines you draw should cross at some point. That point is where the star is located. To find the parallax angle, you draw a middle line in between the two lines. That will then give you an angle (You have two triangle type things, you can use either)

The larger the angle, the closer the star is, the smaller the angle, the further away the star is.
The parallax angle is basically the distance of a star from the earth using the process of parallax to find out.

Hope that helps?DX

Hi, do you have the p7 2013 exam and mark scheme that you could share with me? Thanks in advance

Yes, I do. Here ya go!

And I have also uploaded my P7 revision guide!

I usually revise these things by writing up PowerPoints which I adapt from my revision guides. Saves me writing things out by hands.

I will warn you in advance this one is LONG and not terribly pretty, but some of you may find it useful for revision if you don't have a P7 revision guide or if you want my interpretation of the unit.

Hope you find it helpful!