Nuclear Energy

Question 1

einsteins energy equation

Answer 1

E = mc²

Question 2

what does einsteins equation tell us

Answer 2

that what energy is produced a small amount of mass is lost

Question 3

What unit do you use for atomic and nuclear processes?

Answer 3

Electron volt (eV),16x10-19J

Question 4

what is mass defect?

Answer 4

total mass of nucleons - mass of nucleus

Question 5

binding energy definition

Answer 5

the amount of energy that has to be supplied to separate nucleons completely (an infinite distance apart) , in MeV or J

Question 6

how to find binding energy per nucleon

Answer 6

BEPN = binding energy ÷ no. of nucleons

Question 7

how would you find the binding energy in MeV

Answer 7

• find mass defect in atomic mass units (u)
• convert u to kg by x 1.66x10-27
• use einsteins equation to find energy in J (E=mc ²)
• convert in J to MeV by ÷ 1.6x10-3

Question 8

what is the average BEPN

Answer 8

around 8MeV

Question 9

describe BEPN graph

Answer 9

BEPN, MeV against nucleon no., A
spike down aroound 7 and back up around 6

Question 10

Describe nuclear fission

Answer 10

• massive nucleus is divided and breaks to two less massive nuclei
  -A.bepn is higher than original
• due to inc. in energy,some mass is converted to kinetic energy

Question 11

Describe nuclear fission

Answer 11

• Fusion is the joining of lighter nucleito produce heavier and more stable nuclei
• this results in release of energy
• due to release energy some mass of lighter nuclei is converted to ke energy

Question 12

Why can fusion not take place in room temperature?

Answer 12

Repulsive electric force between positively charged nuclei

Question 13

What does higher binding energy equal in terms of stability

Answer 13

More stable