Luminosity
Explain the difference between luminosity and radiant flux intensity.
Inverse square
A source moves from d to 4d. Find intensity factor.
Standard candle
L=5.0×10²⁹ W and F=1.0×10⁻¹¹ W m⁻². Find d.
Wien's law
A star peaks at 725 nm. Find T.
Stefan–Boltzmann
Temperature doubles at fixed radius. Find luminosity factor.
Redshift
A 656 nm line is observed at 689 nm. Find z.
Hubble law
H₀=68 km s⁻¹ Mpc⁻¹ and v=6800 km s⁻¹. Find d.
Big Bang
State two independent pieces of expansion evidence.