PhysicsHardHigh School (11–12)Modern Physics › Dual Nature of Radiation and MatterNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabTwo statements about the photoelectric effect at a metal surface are given below. Statement I: For a given metal and light above the threshold frequency, doubling the frequency of the light doubles the stopping potential. Statement II: If the stopping potential of each of two different metals is plotted against the frequency, the two straight lines have the same slope, equal to , and cut the frequency axis at different points.
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← The figure shows how the photocurrent of a photocell depends on the potential of its collector, for three narrow beams of single-colour light, 1, 2 and 3. The beams fall in turn on the same cathode in the same tube. The stopping potentials and the saturation currents are read straight from the curves. Which conclusion can be drawn from the figure alone?Assertion (A): An electron and a proton, each starting from rest, are accelerated through the same potential difference of 200 V. The de Broglie wavelength of the electron is about 43 times that of the proton. Reason (R): Each particle gains the same kinetic energy eV, and for a given kinetic energy the momentum of a particle is proportional to the square root of its mass. →
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