Question

(31.6) Estimate the time taken for a sound wave to cross the Sun using eqn 31.11, assuming that the aver- age temperature of the Sun is 6 x 10° K. [Assume that the Sun is mostly ionized hydrogen (protons plus electrons) so that the average mass per par- ticle is about mp/2. The radius R of the Sun is 6.96 x 10 m.]

Answer 1

velocity of adiabatic sound wave rKBT m raft2 e degree of freedom f = 3N-m = 3x1-023 .82 3+2 Average mass of é e proton - Metmp (mp>) me 1.67 Vs 1.67 X 1.38x102x6x106 = 406939.768 nls 1-67x10-27 - 4.078 105 m/s Distance travelled a diameter of sun - 2x radius - 2x6.96*108 z 1.392x10 m. ta a 1.392x10² 2 3420.658 4.078105 2 3420.65 min z 57 min