Stellar Spectra 0.0 / 5 ? PhysicsAstrophysicsASWJEC Created by: TigerLilly321Created on: 10-05-17 15:25 The value of peak wavelength in the spectrum can tell us... the star's surface temperature 1 of 16 The absorption lines in the spectrum can tell us... A) which elements are present in the star's atmosphere. B) the abundance of these elements (and confirm the temperature) 2 of 16 The power received from a star can tell us (through Stefan's law)...... as long as we know the... the radius of the star, distance and star's temperature 3 of 16 What is the surface temperature of our sun? About 5800K 4 of 16 What are the two primary laws you need to know? Wien's law and Stefan's law 5 of 16 What do you need to use Wien's law? Wien's constant, Surface temperature and/or peak wavelength 6 of 16 What is a continuous spectrum with lines in called? An absorption spectrum 7 of 16 What is the main difference between an actual star and a 'black body' spectrum graph? The light intensity drops at certain wavelengths e.g. there are dips in the graph 8 of 16 What could be causing the dips/black lines in the spectrum? Specific wavelengths are being absorbed by specific elements in the star's atmosphere 9 of 16 Where in the star is the continuous spectrum produced? The photosphere 10 of 16 Where does the absorption of wavelengths occur in the star? The atmosphere 11 of 16 What is nuclear fusion? Fusing two or more nuclei in atoms which then release radiation after becoming unstable 12 of 16 What makes it difficult to replicate here on earth? Needs high temperatures and pressures 13 of 16 What does the gradient of a peak wavelength-1/T graph represent? Wien's constant 14 of 16 What is Wien's constant? 2.9x10^-3 15 of 16 what is the range of the visible part of the spectrum (in nanometres)? 400 to 700 nm 16 of 16
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