Question

2. Gravitational Redshift Shortly after the original Pound-Rebka experiment, Brault (1962) measured the red- shift of the Sodium D line emitted from the surface of the Sun. (a) Solve Poisson's equation, the mass. [4 marks] (b) Calculate the gravitational potential at the surface of the Sun, and use the weak field expansion of the gu component of the spacetime metric to argue that this is truly a weak-field. Note that the Sun's mass and radius are approximately Mo 2 x 1030 kg and R 700, 000 km, respectively.

Answer 1

2 fierd F to volume of pa tins p we fen n YR rass of tue stan

H ence

(D) 斤torn EaCD we have, 30 lo