The proton-proton chain needs high temperature because a. of ...

[kamilo84]

The proton-proton chain needs high temperature because
 
  a. of the ground state energy of the hydrogen atom.
  b. of the presence of helium atoms.
  c. the protons must overcome the Coulomb barrier.
  d. of the need for low density.
  e. the neutrinos carry more energy away than the reaction produces.

Question 2

Which type of curve would accurately represent a closed orbit?
 
  a. ellipse
  b. hyperbola
  c. parabola
  d. straight line

[ndhahbi]

Answer to Question 1

c

Answer to Question 2

a

[kamilo84]

Thanks for the timely response, appreciate it

[lkanara2]

Gracias!