Flux, luminosity, inverse-square law, photometric systems and spectral lines.
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Q1 · Photometry and Spectroscopy · MEDIUM
Two stars have apparent magnitudes m₁ = 3.0 and m₂ = 6.0. What is the ratio of the flux received from star 1 to that from star 2?
Q2 · Photometry and Spectroscopy · HARD
A star's spectrum shows a prominent absorption line at observed wavelength 656.5 nm. This line corresponds to the Hα line with rest wavelength 656.3 nm. What is the radial velocity of the star relative to Earth (assuming non-relativistic motion)?
Q3 · Photometry and Spectroscopy · EASY
Two stars A and B have apparent magnitudes of 3.5 and 6.0 respectively. What is the ratio of the brightness of star A to star B as observed from Earth?
Q4 · Photometry and Spectroscopy · MEDIUM
A star has an absolute magnitude of +2.0 and an apparent magnitude of +7.0. What is the distance to this star in parsecs?