Which element has the lowest mass per nuclear particle and ...

[KWilfred]

Which element has the lowest mass per nuclear particle and therefore cannot release energy by either fusion or fission?
 
  A) hydrogen B) iron C) oxygen D) silicon

Question 2

From what cosmic epoch do the photons in the cosmic background radiation originate?
 
  A) the end of the era of nuclei
  B) during the era of nucleosynthesis
  C) during the era of galaxy formation
  D) the end of the Planck era
  E) the moment of the Big Bang

[ecabral0]

Answer to Question 1

B

Answer to Question 2

A

[KWilfred]

Thank you!

[ecabral0]

Always glad to help...