Aradio wave has a frequency of 3.20 × 108 hz. what is the energy (in j) of one photon of this radiation? enter your answer in scientific notation. × 10 j

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?