Binding Energy

• A

• B

• C

• D

After 64 days the activity of a radioactive nuclide has fallen to one sixteenth of its original value. The half-life of the radioactive nuclide is

• 2 days

• 4 days

• 8 days

• 16 days

Nuclear binding energy is

• the energy required to overcome the electrostatic force between the protons in the nucleus

• energy equivalent of the mass of the protons in the nucleus

• the energy equivalent of the mass of all the nucleons in the nucleus

• the energy equivalent of the difference between the total mass of the individual nucleons and their mass when they are contained in the nucleus

Which of the following best describes the decay constant for a radioisotope?

• The reciprocal of the half-life of the radioisotope.

• The rate of decay of the radioisotope.

• The constant of proportionality which links half-life to the rate of decay of nuclei.

• The constant of proportionality which links rate of decay to the number of undecayed nuclei.

• A

• B

• C

• D

• 1.28 pJ

• 94.7 pJ

• 103 pJ

• 230 pJ

A pure sample of nuclide X containing N nuclei has an activity A.

The half-life of X is 6000 years.

A pure sample of nuclide Y containing 3N nuclei has an activity 6A.

What is the half-life of nuclide Y?

• 1000 years

• 3000 years

• 12 000 years

• 18 000 years

Nobelium-259 has a half-life of 3500 s.

What is the decay constant of nobelium-259?

• 8.7 × 10^–5 s^–1

• 2.0 × 10^–4 s^–1

• 1.7 × 10^–2 s^–1

• 1.2 × 10^–2 s^–1

• 5.0 MeV

• 5.5 MeV

• 6.0 MeV

• 6.5 MeV

• 0.00589 u

• 3.01494 u

• 3.02083 u

• 3.02323 u