Quiz1-2

The work function of cesium is 2.1 eV. ▾ Part A Determine the lowest frequency photon that can eject an electron from cesium. Express your answer with the appropriate units. Templates Symbols undo' rego Teset keyboard shortcuts Help Value Units Request Answer Part B Determine the maximum possible kinetic energy in electron volts of a photoelectron ejected from the metal that absorbs a 320-nm photon. Express your answer in electronvolts. Templates Symbols undo' redo Teset keyboard shortcuts Help Kmax= eV f= Submit

Pls answer number 1 thank you so much

Please provide a clear explanation and calculation. Thank you.

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Which of the effects listed below are considered to be the main limiting factors for increasing thecurrent density of the photoelectrodes? (More than one answer possible.) a. Bandgap of the semiconductor forming the photoelectrode b. Reflection in the electrolyte between the light source and the photoelectrode c. Separation of charges in the photoelectrode semiconductor material d. Catalytic effects in the photoelectrode surface e. Mass transport of ions within the electrolyte

Learning Goal: To understand the experiment that led to the discovery of the photoelectric effect. In 1887, Heinrich Hertz investigated the phenomenon of light striking a metal surface, causing the ejection of electrons from the metal. The classical theory of electromagnetism predicted that the energy of the electrons ejected should have been proportional to the intensity of the light. However, Hertz observed that the energy of the electrons was independent of the intensity of of the light. Furthermore, for low enough frequencies, no electrons were ejected, no matter how great the intensity of the light became. The following problem outlines the methods used to investigate this new finding in physics: the photoelectric effect. Submit Part D Request Answer In a 1905 paper that later won him a Nobel Prize, Albert Einstein postulated that the energy of light was proportional to its frequency. The constant of proportionality turned out to be Planck's constant h: Elight = hf. Using your…

Assume you shine a light at the same wavelength as in the previous question, but of greater intensity (a brighter light) on magnesium. What is the best description of the observation you would make after this change? a. More electrons are released from the surface, but their maximum kinetic energy is higher than before.  b. More electrons are released from the surface, but their maximum kinetic energy is the same as before. c. The same amount of electrons is released, but they have less kinetic energy than before. d. The same amount of electrons is released, but they have more kinetic energy.

A certain photoelectric devise is sensitive to wavelengths up to 940 nm. a. What is the frequency associated with this wavelength? b. What is the work function for the cathode if the threshold wavelength is 890 nm? c. What is the frequency of 690 nm light? d. If light with a wavelength of 690 nm strikes the photocathode, what is the maximum kinetic energy of the emitted electrons?