radioactivity

Question 1

define activity, and give it’s Unit

Answer 1

the rate of decay of a nuclei of radioactive source,
measured in Becquerel, Bq

Question 2

define decay constant

Answer 2

the probability that an individual nucleus will decay per unit time

Question 3

define half life

Answer 3

the time taken for a radioactive nuclide to decay to half its original value

Question 4

radioactive decay

Answer 4

the spontaneous disintegration of a nucleus to form a more stable nucleus, resulting in the emission of an alpha beta or gamma particle

Question 5

define binding energy

Answer 5

the minimum amount of energy required to break a nucleus into its protons and neutrons

Question 6

define mass defect

Answer 6

the difference between the mass of a nucleus and the sum of its individual masses of its protons and neutrons is that

Question 7

define binding energy per nucleon

Answer 7

binding energy of a nucleus divided by the number of nucleons in the nucleus

(the higher the value the more stable it is)

Question 8

why migh the count rate be less than the activity of the sample

Answer 8

-radiation is emitted in all directions and detector only does it in one way
-some emissions are absorbed before they reach the detector
-simultaneous arrival of multiple particles only registers once