Font size
WorksheetsNuclear physics
Total questions: 10
Worksheet time: 22mins
Which nuclide is the most stable?
calcium-40
hydrogen-1
iron-56
carbon-12
Which shows correctly the calculation of mass defect of a nucleus?
(mass of nucleus) − (total mass of separate neutrons)
(total mass of separate neutrons) − (mass of nucleus)
(mass of nucleus) − (total mass of separate nucleons)
(total mass of separate nucleons) − (mass of nucleus)
What is meant by binding energy?
minimum energy required to separate nucleons in a nucleus to infinity
maximum energy required to separate nucleons in a nucleus to infinity
minimum energy required to remove one nucleon from a nucleus
maximum energy required to remove one nucleon from a nucleus
Uranium-235 has 92 protons and a binding energy of 1786 MeV. Calculate its binding energy per nucleon.
19.4 MeV
7.6 MeV
12.5 MeV
0.13 MeV
Which of the following statements is wrong?
Activity is the number of decay per unit time.
Activity depends on half-life.
Activity depends on decay constant.
Activity can measured directly using a GM tube.
A house is found to have high level of radon gas. The acitivity is 2000 Bq per unit cubic metre of air. The action level recommended by UK is 200 Bq/m3. How long does it take for activity to fall below the action level if there is no influx of more radon gas? (half life of radon = 3.8 days.)
13 days
19 days
23 days
10 days
Which of the following equations about activity (A), count rate (R), and number of undecayed nuclei (N) are correct?
A=A0eλt
R=R0e−λt
N=N0eλt
N=N0e−λt
A sample of cobalt-60 has a mass of 8.84×10−10 g and activity of 3.7×104 Bq. What is the half-life of cobalt-60? (NA=6.02×1023; u=1.66×10−27 kg.)
5.27 days
5.27 years
52.7 years
527 years
Which of the following cause measured count rate to be different than activity? (Select all.)
Detector has dead time.
Radiation is absorbed by the sample.
Detector has 100% efficiency.
Detector covers sample fully.
There is background radiation.
Which of the following steps is NOT required when measuring half-life of radioisotope that is extremely long-lived?
Measure number of parent nuclei
Plot activity against time
Use A=λN
Measure activity
