Albert Einstein won the Nobel Prize in Physics for his explanation, in 1905, of
ID: 1288615 • Letter: A
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Albert Einstein won the Nobel Prize in Physics for his explanation, in 1905, of the photoelectric effect. Einstein showed that the results of the experiment can only be explained in terms of a particle model of light - light must be acting as if it is made up of particles (known as photons) rather than waves. This was especially fascinating since many other experiments can only be explained in terms of light acting as a wave.
Albert Einstein won the Nobel Prize in Physics for his explanation, in 1905, of the photoelectric effect. Einstein showed that the results of the experiment can only be explained in terms of a particle model of light - light must be acting as if it is made up of particles (known as photons) rather than waves. This was especially fascinating since many other experiments can only be explained in terms of light acting as a wave. (a) What are the predictions of the particle theory regarding this experiment? Select all the correct statements from the list below. There is a threshold frequency below which no electrons are emitted by the metal. There is no threshold frequency - electrons should be emitted at all frequencies. If the light intensity is increased, the maximum kinetic energy of the emitted electrons should also increase. Above the threshold frequency, turning up the intensity of the light causes more electrons to be emitted but does not affect the maximum kinetic energy of the emitted electrons. If the frequency of the light increases, the maximum kinetic energy of the emitted electrons should also increase no matter what the light intensity is. (b) What are the predictions of the wave theory regarding this experiment? Select all the correct statements from the list below. There is a threshold frequency below which no electrons are emitted by the metal. There is no threshold frequency - electrons should be emitted at all frequencies. If the light intensity is increased, the maximum kinetic energy of the emitted electrons should also increase. Above the threshold frequency, turning up the intensity of the light causes more electrons to be emitted but does not affect the maximum kinetic energy of the emitted electrons. If the frequency of the light increases, the maximum kinetic energy of the emitted electrons should also increase no matter what the light intensity is. (c) The chemical symbols for the three metals available to you in the simulation are Al for aluminum, Ag for silver, and Na for sodium. Using these chemical symbols, rank the three metals based on their work functions, from largest to smallest. Use only > and for = signs in your ranking (e.g., Al > Ag = Na).Explanation / Answer
(a) For particle theory the predictions are:
There is a threshold frequency below which no electrons are emitted by the metal.
Above the threshold frequency, turning up the intensity of the light causes more electrons to be emitted but does not affect the maximum kinetic energy of the emitted electrons.
If the frequency of the light increases, the maximum kinetic energy of the emitted electrons should also increase no matter what is the light intensity.
(b) For Wave theory predictions are:
There is no threshold frequency electrons should emitted at all frequencies.
(c) The work function of alunimum is 4.08 eV
Silve is 4.26 to 4.73 eV
Sodium is 2.28 eV
Thus, Ag> Al > Na
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