Author Question: Which of the following best explains why nuclear fusion requires bringing nuclei extremely close ... (Read 48 times)

cherise1989

  • Hero Member
  • *****
  • Posts: 555
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
 
  A) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together.
  B) Fusion can proceed only by the proton-proton chain, and therefore requires that protons come close enough together to be linked up into a chain.
  C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold.
  D) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together.

Question 2

What is the primary form of evidence that has led astronomers to conclude that the expansion of the universe is accelerating?
 
  A) observations of the speeds of individual galaxies in clusters
  B) measurements of how galaxy speeds away from the Milky Way have increased during the past century
  C) observations of white dwarf supernovae
  D) measurements of the rotation curve for the universe



brbarasa

  • Sr. Member
  • ****
  • Posts: 308
Answer to Question 1

C

Answer to Question 2

C



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

Did you know?

Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

Did you know?

The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

For a complete list of videos, visit our video library