Astrophysics Revision Quiz

What is the power per square meter received by Earth from the Sun?

• 1.3 kilowatts

• 2.0 kilowatts

• 1.5 kilowatts

• 1.0 kilowatts

Why is Stefan-Boltzmann's law not suitable for finding the Sun's luminosity in this problem?

• We are not given the radius of the star or its temperature.

• The law only applies to black holes.

• It requires the mass of the star.

• The law is only applicable to planets.

What equation is used to find the luminosity of the Sun in this scenario?

• Intensity equation

• Newton's law of cooling

• Planck's law

• Kepler's third law

What is the value of one astronomical unit in meters?

• 1.3 x 10^11 meters

• 1.0 x 10^11 meters

• 2.0 x 10^11 meters

• 1.5 x 10^11 meters

What is the calculated luminosity of the Sun in watts?

• 4.0 x 10^26 watts

• 3.7 x 10^26 watts

• 2.5 x 10^26 watts

• 3.0 x 10^26 watts