Physics, 27.06.2019 19:30, keananashville
In an experiment different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. which statement is true? a) the number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths. b) the number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths. c) the maximum kinetic energy of the photoelectrons emitted has a linear relationship with the frequency for each wavelength present. d) the maximum kinetic energy of the photoelectrons has a linear relationship with the light intensity for each wavelength present. e) the maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
Answers: 3
Physics, 21.06.2019 13:20, cjjudecjude5675
An ideal transformer has 60 turns in its primary coil and 360 turns in its secondary coil. if the input rms voltage for the 60-turn coil is 120 v, what is the output rms voltage of the secondary coil?
Answers: 2
Physics, 22.06.2019 16:50, lizzepacheco
Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.
Answers: 2
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