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In an advanced laboratory class a student performs the photoelectric experiment. Ultraviolet light is shone on...

In an advanced laboratory class a student performs the photoelectric experiment. Ultraviolet light is shone on a particular metal and the stopping potential is measured at the same time. It is found that 2.75 V is needed to stop all the electrons when the wavelength of the light is 260 nm, and 4.22 V for a wavelength of 211 nm. What is the work function of the metal?

b) What is Planck's constant based on this measurement?

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