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puceherring24Lv1

28 Sep 2019

What happens to the interference pattern that results from the diffraction of electrons passing through two closely spaced slits if the rate of electrons going through the slits is decreased to one electron per hour?

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28 Sep 2019

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The basis for a particular type of technique used for the analysis of the crystal structure of molecules involves the diffraction of electromagnetic radiation of a particular type by atoms and molecules. This diffraction occurs because the wavelength of the electromagnetic radiation is similar to the size of the particle which causes the diffraction. a) For the sake of this problem, the diameter of an atom causing diffraction is 200 pm. What type of electromagnetic radiation gets diffracted by a crystal made up of the described atoms? b) When beams of electrons are passed at high speed through atoms the electrons can be diffracted. Calculate the speed of an electron that would be necessary for an electron passing through atoms with a diameter of 200 pm. c) When beams of neutrons are passed at high speed through atoms the neutrons can be diffracted. Calculate the speed of a neutron that would be necessary for that neutron to be diffracted when passing through atoms with a diameter of 200 pm.

Physical Chemistry

Which of the following statements is true?

A) A diffraction pattern generated by an electron gun is formed by electrons interfering with one another.

B) The inability of classical theory to explain the spectral density distribution of a blackbody was called the ultraviolet catastrophe.

C) There is no upper limit to the photon energy that can be observed in the emission spectrum of the hydrogen atom.

D) Einstein explained the photoelectric effect by postulating that the energy of light depends on its frequency.

	B and D
	A and B
	B and C
	A and D

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What happens to the interference pattern that results from the diffraction of electrons passing through two closely spaced slits if the rate of electrons going through the slits is decreased to one electron per hour?

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