Two Questions Worth 14 points(Gradpoint)

1. Pu-239 has a half-life of _____.
   
   

240 years

24 years

24,000 years

2,400 years

1. Nuclear fusion has not yet been harnessed as an energy source because _____.
   
   

sufficient pressure cannot be generated

lasers are too dangerous

of a lack of deuterium

the energy is hard to control