Summary
Summary Radiation to investigate stars
- Module
- PH2 - Waves & Particles
- Institution
- WJEC
Unit 2 a level physics notes
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stellar spectrum• stars emit light as a continuous
spectrum of radiation classifying stars: • Luminosity = P • distance (R)
• light must pass through the gases • temperature, luminosity, size, distance P = I 4 TR2 ↳ need to know radius + temperature
in the stars atmosphere using the 3 laws • Temperature RE
• atoms in the gas absorb some weins law T = W TTI
wavelength of light leaving Stefan's law 2 max
absorption spectrum Inverse square law • size of star (radius)
• continuous spectrum due to P-A0T" = TIRZOT"
radiation of all wavelengths Properties of a star: p²: P re p
emitted from the surface of star. . Wiens law TO TY TOTH
2 Max = FEW- 2.9 × 10-3
Black bodies: ← in Kelvin C. → k = 0+273. 15
• stars can be called black bodies. • Stefan s law
• B lack bodies absorb all radiation P - A OT4
• very good emitters of radiation ↑ surface area (T92)
Blackbody spectrum: 0=5.67×10-8
temp-10,000k • power can be known as energy
released or luminosity.
£: • Inverse square Law: - multi wavelength astronomy-
temp = 7250K I =P ↳ studying stars and space
YT1R 2 < surface area of
É a sphere can give more information about
R-distance to the star the processes which took place.
0 200 400 600 00
waiiien.in → images taken using different
→ higher the peak intensity, Peak wavelengths: Imax telescopes specific to E. M spectrum
higher the temperature 400mm → Blue
→ peak intensity wavelength is 700mm → Red
inversely proportional to the
temperature of the star.
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