Acertain minimum energy, , is required to eject an electron from a photosensitive surface. any energy absorbed beyond this minimum gives kinetic energy to the ejected electron. when 510.-nm light falls on a cesium surface, an electron is ejected with a kinetic energy of 8.85Ă—10-20 j. when the wavelength is 430. nm, the kinetic energy is 1.61Ă—10-19 j. a calculate for cesium, in joules.
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Physics, 22.06.2019 10:30
Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.
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Physics, 22.06.2019 11:20
The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)
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Physics, 22.06.2019 15:00
Give an example in which the electrical energy changes to light energy
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Physics, 22.06.2019 17:30
Which basic property determines a colored light's placement on the spectrum of visible light? a. speed b. frequency c. amplitude d. velocity
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Acertain minimum energy, , is required to eject an electron from a photosensitive surface. any energ...
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