Astronomy and Cosmology Quiz

What is the term used to describe the total power of radiation emitted by a star?

• Radiant flux

• Intensity

• Brightness

• Luminosity

Which law is used to calculate radiant flux intensity in terms of luminosity?

• Inverse square law

• Stefan–Boltzmann law

• Wien’s displacement law

• Hubble’s law

What is a standard candle in astronomy?

• A star with known temperature

• An object of known luminosity

• A galaxy with known distance

• A planet with known size

What is the purpose of using standard candles in astronomy?

• To measure the temperature of stars

• To determine the age of the universe

• To find the mass of planets

• To calculate distances to galaxies

Which law helps estimate the peak surface temperature of a star?

• Inverse square law

• Wien’s displacement law

• Hubble’s law

• Stefan–Boltzmann law

What does the Stefan–Boltzmann law calculate?

• The radius of a star

• The luminosity of a star

• The distance to a galaxy

• The redshift of light

What phenomenon is observed in the emission spectra from distant objects?

• Increase in wavelength

• Decrease in wavelength

• Random wavelength changes

• Constant wavelength

What does the redshift of electromagnetic radiation indicate?

• The universe is expanding

• The universe is contracting

• The universe is oscillating

• The universe is static

Which formula represents the redshift of electromagnetic radiation?

• v = H_od

What does Hubble’s law relate to?

• The velocity of galaxies

• The luminosity of galaxies

• The temperature of stars

• The mass of planets