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  3. PEARSON (PEARSON)
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  5. Phsyics 2015 Content-led Approach
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  7. Unit 10 - Space

Summary

Summary - Unit 10 - Space
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  • Unit 10 - Space
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  • PEARSON (PEARSON)

A complete summary of edexcel a level physics ’space’ notes, handwritten by an A* physics student (2024), with definitions and diagrams. These notes are a combination of my teachers, physics and maths tutors and further reading to form a complete set of thorough notes.

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Document information

  • October 6, 2024
  • 5
  • 2023/2024
  • Summary

Subjects

  • space
  • edexcel
  • physics
  • a level
  • a level physics
  • as level physics
  • paper 2
  • physcis paper 2
  • handwritten

Written for

  • A/AS Level
  • PEARSON (PEARSON)
  • Phsyics 2015 Content-led approach
  • Unit 10 - Space
All documents for this subject (3)

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7570A

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S

mosity-rateofigengy
pleased
or power ourpor o a




-
>
temperature (k)
↓ ↓ Y

Luminosity (w) Stefan-Boltzmann constant = 5 .
671108 Wm4


received
sity-power from a star per unit area


mins a



~
I = radiant flu
-


emitted from a
-


intensity
point
of

source
EM radiation



Y
intensity (wm2 ( distance




black bodies -


an
object which absorbs and radiates all wavelengths
~


of light equally


mumi's
displacement law-higher temperature ,
lower peak wavelength
intensity
& maxxT
N




A
=
0 0029 .




-
g wavelength



Allax position in comparison to
-


nearer star
apparent change of of a



distant stars




astronomical unit (AU) -


the
average distance between the centre of the earth
ne

and the centre the Sun IAU =
1 5 x10 "m
.


of




parsec
mu
(pc) -


the distance at which the
angle of parallax is I arcsecond

(1/3600th of a
degree
1pc =
2 .
06 x10 Au =
3 .
08 x 10m =
3 26 ly
.

, myear (ly)
-

the distance EM wave travels in in vacuum
an a
year a




| (y
= 9 .
46x10m =
3x108 + (3600 + 24 x 365)



the position of nearby stars movel in elipses

We observe the stars from earth but earth orbits the sun
O
-
: the direction from the star to the observer changes ,



hower
light from distant stars remains almost parallel
d



position of Standard candles


a
mus

is and
G O sun we know the
luminosity of a star
>

↓ ↓
AU we can measure its intensity on earth, we




position of earth can calculate its distance




Cephid variables -


useful stars because they pulse and we know that the
mine
time period their is their
of pulse related to
luminosity


Hertzsprung-Russell diagram the luminosity
-

shows stellar of a star



against its temperature (logarithmic scale

most stars are in the


main sequence




temp decreases
-
>

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