Topic 7 P1 Review

When a nucleus undergoes radioactive β⁺ decay, the change in the number of particles in the universe is

• 0

• 1

• 2

• 3

The rest mass of a proton is 938 MeV c^-2. The energy of a proton at rest is

• 9.38 J

• 9.38 x 10⁸ (3 x 10⁸ )² J

• 9.38 x 10⁸ eV

• 9.38 x 10⁸ (3 x 10⁸ )² eV

Which statement about atomic spectra is NOT TRUE?

• They provide evidence for discrete energy levels in atoms.

• Emission and absorption lines of equal frequency corresponds to transitions between the same two energy levels

• Absorption lines arise when electrons gain energy.

• Emission lines always correspond to the visible part of the electromagnetic spectrum.

The mass defect for deuterium is 4×10^–30 kg. What is the binding energy of deuterium? 

• 4×10^–7 eV 

• 8×10^–2 eV 

• 2×10⁶ eV 

• 2×10¹² eV

This nuclear reaction would be best describe as

• alpha decay.

• nuclear fission.

• nuclear fusion.

• neutron capture

The nuclear reaction in the figure is an example of the transmutation of mercury into gold.

The particle X is a

• gamma-ray photon.  

• helium nucleus.

• proton.

•  neutron.

What are the axis labels for the graph of binding energy per nucleon?

• A

• B

• C

• D

A sample contains an amount of radioactive material with a half-life of 3.5 days. After 2 weeks the fraction of the radioactive material remaining is

• 94 %

•  25 %

• 6 %

• 0 %

A unit in which mass defect can be measured is

• MeV

• MeV c^–1

• MeV c^–2

• MeV per nucleon

A student suggests the following nuclear reaction between deuterium   and tritium, where n and m are integers.

What are X and Y?

 

• X - electron

  Y - neutron

• X - electron

  Y - proton

• X - alpha particle

  Y - neutron

• X - alpha particle

  Y - proton