What is Luminosity?
Luminosity is the total power output of radiation emitted by a star
What is Radiant Flux?
Radiant flux is the observed amount of intensity through a surface per unit area of radiation measured on Earth
What is redshift?
Fractional increase in wavelength (decrease in frequency) due to the source and the observer receding from each other
What is Doppler’s effect?
Doppler effect is the apparent change in wavelength or frequency of the radiation from a source due to its relative motion away from or toward the observer.
What is Wien’s displacement law?
When wavelength of maximum intensity is proportional to thermodynamic temperature.
Hubble’s Law
recession velocity is directly proportional to the distance of the galaxy from the observer
