When the nuclear reactions begin making too little energy in a ...

[LaDunn]

When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:
 
  A) would expand slightly.
  B) would reduce its central temperature.
  C) would increase its density.
  D) would increase the mass by a factor of 2.

Question 2

Only photons with wavelengths _____ can ionize hydrogen.
 
  A) shorter than 91.2 nm
  B) longer than 104.3 nm
  C) shorter than 40 nm
  D) longer than 80 nm

[morganmarie791]

Answer to Question 1

C

Answer to Question 2

A

[LaDunn]

Excellent

[blakcmamba]

Gracias!