If the temperature of a blackbody doubles, what occurs to the wavelength of maximum emission?

If the temperature of a blackbody doubles, what occurs to the wavelength of maximum emission?

By what factor will the energy emitted each second off the surface of a blackbody change if the the temperature of the object is tripled?

By what factor will the energy emitted each second off the surface of a blackbody change if the the temperature of the object is tripled?

Using the kinetic theory of gas, what is the fundamental property of a planet that dictates if it is able to retain an atmosphere?

Using the kinetic theory of gas, what is the fundamental property of a planet that dictates if it is able to retain an atmosphere?