Question

Models of the first star-forming clouds indicate that they had a temperature of roughly 180 K and a particle density of roughly 3.50×105 particles per cubic centimeter at the time they started trapping their internal thermal energy.

Part A: Estimate the mass at which thermal pressure balances gravity for these values of pressure and temperature.

Part B: How does that mass compare with the Sun's mass?

Part C:

What is the estimated lifetime of a star with that mass?

Choose the answer that best fits your estimate

Greater than 10 million years

Less than 10 million years

About 10 billion years

About 1000 years

Answer 1

Gven hat 180 ト1lou,fog molecula. 1a) The ļoU d bel and rrs the -lem peatute 120 k, and pattee deruit

3.50 x 10 180 3.50x10 (00353540 58 3 2oot0 1 (2x10 k 26 32 ma)s o1. Such a mo le culal coud 348 x10

14) LC) {?t.tfme 아 a stan thrserah/ve_ The