Question

how will the temperature of the sun change when it grows to the red giant phase? cooler hotter brighter but no temperature change rewatch submit

Explanation:

When a star like the Sun enters the red - giant phase, it expands. According to the Stefan - Boltzmann law \(L = 4\pi R^{2}\sigma T^{4}\) (where \(L\) is luminosity, \(R\) is radius, \(\sigma\) is the Stefan - Boltzmann constant, and \(T\) is temperature), for a given luminosity increase (due to larger radius \(R\)), the surface temperature \(T\) decreases. Red giants are cooler (lower surface temperature) than main - sequence stars of the same luminosity class in terms of surface temperature.

Answer:

cooler