Validity of cut-off frequency in wave theory and particle theory.

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Chapter 37, Problem 6Q

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Validity of cut-off frequency in wave theory and particle theory.

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During an experiment 8.7×10¹4 Hz light shines on a metal plate and the Photoelectric Effect occurs. It is determined that the stopping potential is 2.3 V. Determine the momentum (in N's) a photon has at the given frequency & determine the cutoff frequency (fo). p= fo=

The figure shows an apparatus for observing the photoelectric effect. In this apparatus, a light source illuminates a metallic emitter plate (E). Photoelectrons are emitted and accelerate toward the collector ring (C). The presence of emitted electrons can be detected by measuring the current flowing in the circuit. Suppose the light source is of a single wavelength (A = 140 nm). Suppose also that the binding energy of electrons in the metal emitter () = 3.8 eV. What is the maximum kinetic energy of emitted electrons? Kmax = For this metal emitter, what is the maximum wavelength for which electrons will be emitted? 1₂ = What will happen if the intensity of the light is decreased (keeping the same wavelength)? 00000 nm ev O The electron current will decrease but not go to zero (and Kmax will be unchanged) The electron current will decrease and Kmax will also decrease the maximum kinetic energy of individual electrons will decrease (no other changes) The electron current may go to zero O…