5.5. Astrophysics and Cosmology

Question 1

Draw the Hertzsprung Russel diagram.

Answer 1

-Y axis = Luminosity (lux units)
-X axis = Temperature ( Kelvin units)
-Y axis start from 10^-4 to 10^6
X axis start from 40000 to 2500
Near bottom graph is dwarfs
Top is super giants
Middle is giants
Diagonally goes main sequence stars

Question 2

What are the 3 spectra

Answer 2

-Emission line spectra
-Continuous line spectra
-Absorption line spectra

Question 3

What is the definition of each spectra

Answer 3

Emission = Each element produces a unique emission line spectrum because of the unique energy levels
Continuous = All visible wavelengths of light are present
Absorption = A series of dark spectral lines against the background of the continuous spectrum

Question 4

What does Wiens law state

Answer 4

the black body radiation curve for different temperature peaks at wavelength inversley proportional to the temperature of the object