The following observations are made about the photoelectric effect :1. No electrons are emitted below the threshold frequency2. Above the threshold frequency, the energy of the emitted electronsdepends only on the frequency of light3.Increasing the intensity of the light increases the number of emittedelectronsWhich, if any, of these observations can be explained by a wave theory oflight?ABCDAll of them1 and 2 only2 and 3 onlyNone of them

For a given photosensitive material, there exists a certain minimum cut-off frequency of the…

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In a photoelectric effect experiment, light was shone on a metal surface and the data below were recorded. 13. Maximum kinetic Frequency of incident light (×10“ Hz) energy of ejected electrons (×10 " J) 6 1 7 1.6 8. 2.3 2.9 i) Graph these results, including the line of best fit. frequency (x10“ Hz) ii)Use the graph to determine the work function for this metal surface. Exmax (× 10-19 J)
39 if we plot a graph between frequency of light used and maximum K.E of photoelectrons it will be a straight line as shown below in the diagram. Which statement is true about the graph shown in the diagram? * G (K.E) max Frequency (f) The slope of the graph is measure of light intensity. The number of ejected electrons depends upon frequency The slope of the graph is work function of the photo emissive surface O The slope of the graph is constant called Planck's constant
Photons of wavelength 248.6 nm strike a metal whose work function is 3.5 eV. What is the KE of the most energetic photoelectron? a) 1.5 eV b) 2.5 eV c) 3.5 eV d) none of these.
Tantalum has a work function of 4.2 eV. The most energetic photoelectron has KE of 2.12 eV. What is the wavelength of the incoming photons? a) 586 nm b) 197 nm c) 296 nm d) none of these.
9. Considering the photoelectric effect; a) If a material has a cutoff wavelength of 780 nm what is the work function of the material? b) What is the maximum speed of liberated electrons when light with a wavelength of 410 nm is used to illuminate the material? If a liberated electron has 3.2349 eV of kinetic energy and it was a photon emitted from a hydrogen atom transition that liberated it, what energy level transition occurred? State both the initial and final energy level.
QUESTION 24 When ultraviolet light with a wavelength of 317 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.76 x 10-1 J. How much energy, in Joule, does an electron have to gain in order to escape from the metal surface? Exponential format with 3 SF.