6. The photoelectric effect is an important experiment in the development of qua

Question

6. The photoelectric effect is an important experiment in the development of quantum mechanics. What is not the experimental observation of the photoelectric effect? write down the correst statement in the Greenbook .nationale a. Electrons are ejected essentially instantly after illumination begins, no matter how low b. If the frequency of the illuminating light is below a certain value, no electrons are c. For a fixed fequency of illuminating light, the electron's maximum kinetic energy is d. Above a metal's cutoff frequency, the electrons' maximum kinetic energy is directly the intensity is. ejected, no matter how intense the light is. directly proportional to the intensity of the illuminating light. proportional to the frequency of the illuminating light, with the same slope for all metals. 7. The metals sodium, iron, and molybdenum have work functions of 2.5 eV, 39 eV, and 42 ev, respectively. Which of these matals will emit photoelectrons when illunimated with 400 nm light? a. Sodium b. Iron C. d. None of them produces photoelectrons 8. When a photon has the same wavelength as an electron which has the kinetic energy of 12 eV, what is the energy of the photon? a. 5.6 x 1016 eV b. 12 eV c 24 ev d. 3.5 keV 9. Consider a beam of free particles that each have a certain (non-relativistic) kinetic energy KE If we double this kinetic energy, what happens to the beam's de Broglie wavelength? a. increases by a factor of 2. b. increases by a factor of 212, c. remains the same. d. decreases by a factor of 212, e. decreases by a factor of 2. 10. Select the incorrect statement in a quanton (electron and photon) at a time interference experiment. As a rationale write down the correct statement in the Greenbook a. When we know the precise trajectory of individual quantons at all time, we observe an intereference pattern. b. In one quanton at a time experiment, detectors register discrete detection events. c. Quantons seem to prefer certain locations and avoid others in the array of detectors. d. We find the probability of a given quanton to arrive at a given point is proportional to the intensity of the interference pattern predicted by the wave model.

Explanation / Answer

Answer 6:

The statement in Option c is wrong.

For a fixed frequency, the maximm kinetic energy of electron is fixed. Increasing the intensity only increaeses the number of electrons ejected, The maximum kinetic energy remains the same.

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