Physics, 12.12.2019 05:31 jamarcusweverjr1133
Acolloid consists of particles of one type of substance dispersed in another substance. suspensions of electrically charged microspheres (microscopic spheres, such as polystyrene) in a liquid such as water can form a colloidal crystal when the microspheres arrange themselves in a regular repeating pattern under the influence of the electrostatic force. colloidal crystals can selectively manipulate different wavelengths of visible light. just as we can study crystalline solids by using bragg reflection of x rays, we can study colloidal crystals through bragg scattering of visible light from the regular arrangement of charged microspheres. because the light is traveling through a liquid when it experiences the path differences that lead to constructive interference, it is the wavelength in the liquid that determines the angles at which bragg reflections are seen. in one experiment, laser light with a wavelength in vacuum of 650 nm is passed through a sample of charged polystyrene spheres in water. a strong interference maximum is then observed when the incident and reflected beams make an angle of 39∘ with the colloidal crystal planes.
what plane spacing in the colloidal crystal could produce the maximum in this experiment?
650 nm 520 nm 390 nm or 780 nm
Answers: 3
Physics, 22.06.2019 17:30, evanwall91
Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.
Answers: 2
Physics, 22.06.2019 18:00, maren17
Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)
Answers: 3
Acolloid consists of particles of one type of substance dispersed in another substance. suspensions...
Mathematics, 23.02.2021 21:00
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