Edexcel A2 Physics Unit 5 'Physics from Creation to Collapse'

RADIUS OF A STAR

-Disperse light to produce a spectrum.
-Get the max wavelength.
-Get the surface temperature using the Weins Law
-Check if the star lies in the Hertzsprung-Russell Diagram.
-If so get the Luminosity of the star.
-Use stefan-boltzmann law to get the radius.

Reply 161

omegaSQU4RED

18

yadas

Thanks, but I cant find any part of our syllabus this is related to. :K:

131 Use a simple Hertzsprung-Russell diagram to explain life cycle of stars.
I doubt we would need to remember all those points of star formation. :K:

Well we just need to remember the scales on the axes, roughly where each region is (e.g. white dwarves, red giants/supergiants, main sequence) and to appreciate that a star moves across the Hertzsprung-Russell diagram throughout its lifetime.

Reply 162

yadas

OL1V3R

Well we just need to remember the scales on the axes, roughly where each region is (e.g. white dwarves, red giants/supergiants, main sequence) and to appreciate that a star moves across the Hertzsprung-Russell diagram throughout its lifetime.

Exactly, not the whole 'formation of a star' story. :smile:

Reply 163

omegaSQU4RED

18

yadas

Exactly, not the whole 'formation of a star' story. :smile:

I thought we did have to remember that!

Reply 164

yadas

OL1V3R

I thought we did have to remember that!

You just agreed we should only be able to use the diagram. :biggrin:

Which part (number) of the syllabus is it referring to anyway?

Reply 165

Pegasus92

Starting phy5 revision for the day.

Reply 166

lefneosan

1

Hi does anyone know a solid website for physics which has stuff designed for a level so you can just read it to know it? I practically learnt chemistry off the chemguide website so I was rather hoping to repeat that. Anyone?

Reply 167

JayAyy

14

I can't even prepare for this exam yet, I've got two economics exams this week :colonhash:

Reply 168

Doughboy

9

I have BIO5 with article :colonhash:

Reply 169

yadas

I have enough time to prepare. :colonhash:

Reply 170

The Magnificent KoloToure

lefneosan

Hi does anyone know a solid website for physics which has stuff designed for a level so you can just read it to know it? I practically learnt chemistry off the chemguide website so I was rather hoping to repeat that. Anyone?

S Cool is OK, but the revision books will be a million times better.

Reply 171

Pegasus92

yadas

I have enough time to prepare. :colonhash:

same here only phy5 left.

Reply 172

omegaSQU4RED

18

Can someone explain to me why this radiation spectrum from the Sun has a wavelength of maximum intensity corresponding to blue light, when the Sun is orange? I don't understand this, could it be due to Doppler shift?

Reply 173

lefneosan

1

The Magnificent KoloToure

S Cool is OK, but the revision books will be a million times better.

thanks

Reply 174

havinghoops

I am trying to collect questions I have found that are relevant to the subjects. This is what I've got so far. It's not perfect as they're just questions I've collected from the 'net so are not moulded specially for the specification, but they should help to test your understanding.

Has anyone got anything to add?

I'll upload other units as I get more.

RADIOACTIVE DECAY Q.docx15.3KB

RADIOACTIVE EMISSIONS Q.docx17.7KB

SHM-all[1].pdf152.4KB

SIMPLE HARMONIC MOTION Q.pptx1809.9KB

THERMAL PHYSICS PRACTICE Q.docx43.9KB

Reply 175

fredbraty

7

havinghoops

I am trying to collect questions I have found that are relevant to the subjects. This is what I've got so far. It's not perfect as they're just questions I've collected from the 'net so are not moulded specially for the specification, but they should help to test your understanding.

Has anyone got anything to add?

I'll upload other units as I get more.

Thank you!!!!!!!!!!!!! :smile:

Reply 176

havinghoops

OL1V3R

Can someone explain to me why this radiation spectrum from the Sun has a wavelength of maximum intensity corresponding to blue light, when the Sun is orange?

I thought it was because the sun peaked at UV light, which can't be seen.

And fredbraty, no problem :smile:

Reply 177

Pegasus92

havinghoops

I am trying to collect questions I have found that are relevant to the subjects. This is what I've got so far. It's not perfect as they're just questions I've collected from the 'net so are not moulded specially for the specification, but they should help to test your understanding.

Has anyone got anything to add?

I'll upload other units as I get more.

thanks

Reply 178

yadas

havinghoops

I am trying to collect questions I have found that are relevant to the subjects. This is what I've got so far. It's not perfect as they're just questions I've collected from the 'net so are not moulded specially for the specification, but they should help to test your understanding.

Has anyone got anything to add?

I'll upload other units as I get more.