Week 4, clip 15

Timepoint:  03:31.7

1) There was an error here for the pressure formula, $$P=m \rho k_B T$$.  What should the formula read, if it were corrected?

- P = ( rho * k_B * T ) / m
- P = ( m * k_B * T ) / rho
- P = ( k_B * T ) / ( m * rho )
- P = 1 / ( m * rho * k_B * T ) 

Timepoint:  19:25.7

2) As the Sun ages, which of the following changes are likely to occur?  Check all that apply.

- The Sun's radius will increase.
- The Sun will become brighter (increased luminosity).
- The Sun will lose mass more rapidly due to a lower surface escape velocity.
- The Sun's core will contain increasing amounts of helium.

Answers:
1) P = ( rho * k_B * T ) / m

2) All of these are likely to occur as the Sun ages.