Light of wavelength 350 nm falls on a potas- sium surface, and the photoelectrons have a maximum kinetic energy of 1.3 eV. What is the work function of potassium? The speed of light is 3 × 10° m/s and Planck's constant is 6.63 × 10' -34 J.s. Answer in units of eV. What is the threshold frequency for potas- sium? Answer in units of Hz.

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