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A Calcium surface (work function = 2.87 eV) is illuminated with 200 nm light from a 2 mW laser.
How many photons per second are emitted by the laser?
Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.018%.
What is the current in the detector assuming all the emitted electrons are captured?
Note that current is charge(in Coulombs) per second. The charge of one electron is 1.6 x 1019C
A not so brilliant physics student wants to jump from their third floor apartment window to the swimming pool below. obtain how fast does the student have to be running horizontally to make sure they make it to the pool's edge
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A long, straight wire carrying a current of 5.00 A is placed along the axis of a cylinder of radius 0.500 m and a length of 5.00 m
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The average distance between the proton and the electron in a hydrogen atom is 5.29 x 10-11 m. With the particles separated by this distance, the 'Bohr radius,' what is the electric potential energy of the configuration?
A satellite moves in a circular orbit around Earth at a speed of 5449 m/s. Decide the satellite's altitude above the surface of Earth. Decide the period of the satellite's orbit.
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