Stars and planets - An introduction - questionnary 20241127

 Which nuclear reactions dominate in the Sun?
 Which timescale is the shortest?
 In a star that contracts quasi-statically (i.e. slowly enough to remain in hydrostatique equilibrium), the internal pressure
 The total energy of a bound star in hydrosatique equilibrium equals
 When a star contracts, half of its gravitational potential energy is heating the star
 When a star contracts, half of its gravitational potential energy is radiated away
 The transport of energy by radiation is a
 The main source of opacity in a massive star is
 The first equation of stellar structure describes
 The first equation of the internal structure of stars links
 The second equation of the internal structure of stars provides a relation between
 Inside a star that is in hydrostatic equilibrium
 The equation of state of a gas relates
 The free fall time is the time for a star to collapse if
 What is the order of magnitude of the free fall time of a 1 solar mass star
 During most of their lifetime, stars evolve quasi-statiscally
 he virial theorem relates
 A star which contracts quasi-statically gets
 A star is bound if its total energy is
 Half of the energy liberated by the contraction of a star is used for heating the star. The other half is