Question: Electrons are ejected from a surface with speeds ranging up to 789 km/s when light with a wavelength of 494 nm is used. What is

Electrons are ejected from a surface with speeds ranging up to 789 km/s when light with a wavelength of 494 nm is used. What is the work function of this surface? The speed of light is 2.99792 108 m/s and Planck's constant is 6.62607 1034 J s. Answer in units of eV.

2. What is the threshold frequency for this surface? Answer in units of Hz.

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