How do astronomers know what wavelength the body will emit when it is at rest?
9646
How is Doppler redshift of distant galaxies established?
113637
How does stuff glow in the dark?
81190
Why does the blackbody radiate even at thermal equilibrium?
71445
What causes a black-body radiation curve to be continuous?
139947
Tired light red shift hypothesis
133259
Loss in energy by light after reflections
126355
Can we see emission lines in stars?
146268
Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
11053
Planck's Law in terms of wavelength
37533
Emission of EM radiation from an electron
82470
Why is there an emission of gamma rays?
114913
What exactly is meant by the wavelength of a photon?
31758
What determines color -- wavelength or frequency?
52598
How can I interpret "energy" in signals?
63513
What is the minimum wavelength of electromagnetic radiation?
51802
What is the frequency of a photon?
53874
Why don't absorption and emission lines cancel out in our Sun?