The surface of a star is radiating as a black body with a temperature of 6000 K. If the temperature.

The surface of a star is radiating as a
black body with a temperature of 6000 K. If the temperature were to increase by
250 K, by what fraction would the energy liberated per unit area increase?

The constant in Wien’s displacement law is
2·90 × 10−3 m K. What is the wavelength corresponding to the
maximum radiation output of a star whose surface temperature is 5000 K?