Ch25_2
 
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1) An electron beam scattered off a crystal at a scattering angle of 0 produces a second order diffraction maximum. What is the kinetic energy (nonrelativistically) of the electrons in eV if the crystal plane spacing is nm (sheet 22,27) ? Indicate with a positive (negative) sign whether here the particle (wave) property of the electron becomes evident.
2) An atom makes a transition from its current state into an energy state which is eV higher. Indicate with a negative (positive) sign whether a photon is emitted (absorbed) by the atom and calculate the wavelength of the photon (sheet 32).
3) What is the total (total refers to kinetic + potential here) energy (in eV) of the electron in the Bohr model for a hydrogen like atom (all but one electrons removed) with Atomic Number (number of protons or electrons in the neutral atom) in its lowest state, the "ground state" (sheet 35,36') ? Include the correct sign of the energy.
4) A hydrogen atom makes a transition from a state with quantum number to a state with quantum number . Indicate with a negative (positive) sign whether the atom loses (gains) energy and calculate the energy in eV (sheet 36).
5) In an X-ray tube electrons traverse an accelerating voltage of kilovolts. What is the minimum wavelength of the X-ray photons in nm (sheet 39) ? Indicate with a positive (negative) sign whether the photons belong to the continuous (discrete, quantized) part of the X-ray spectrum.
6) The atomic number of the anode (the positively charged plate emitting the X-rays) material is . What is the wavelength of the K-alpha photons emitted in nm when the atom makes a transition from the n=2 to the n=1 state (sheet 40') ? Indicate with a positive (negative) sign whether the photons belong to the continuous (discrete, quantized) part of the X-ray spectrum.

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