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?

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