Reference no: EM132599430

1. The medical procedure where a patient is injected with radioactive material, and the decay products of that material annihilate inside the patient to produce a pair of back-to-back photons which can be detected is called

Select one:

a. magnetic resonance imaging 
b. proton emission tomography
c. computed tomography 
d. positron emission tomography

2. What is the magnitude of the momentum of an electron (in kg m s-1) with a de Broglie wavelength of 14.0 nm?

3. The Heisenberg Uncertainty Principle can be used to calculate the uncertainty in the energy of an emitted photon from a state with lifetime τ.

Calculate the energy uncertainty for a state with a lifetime of 6.7 picoseconds, expressing your answer in eV to 2 sf. Δ Δ ≥(h/4 )

4. The distance between atoms in a crystal of NaCl is 0.371 nm. The crystal is being studied in a neutron diffraction experiment. At what speed (in m/s) must the neutrons be moving so that their de Broglie wavelength is the same length as the spacing between the atoms? (Assume the neutrons are non-relativistic.)

5. Calculate the lowest possible uncertainty in the velocity for an electron, (mass 9.11×10-31 kg) where the position is known to an uncertainty of 2.9×10-11m. Give your answer to 2 sf.

6. A semiconductor is struck by light of slowly increasing frequency and begins to conduct when the wavelength of the light is 513 nm. Estimate the energy gap,gap, ,Give your answer in eV to three s.f.