Solved: Maximum kinetic energy of ejected electron, Physics

Maximum kinetic energy of ejected electron

Assignment:

Question 1. Suppose that a photon has energy of 5 x 10 -19 J. (five times ten to the negative 19th Joule) What's the wavelength of this photon? What is its frequency?

Question 2. The photon in the above problem strikes a metal plate that has a work function of PHI = 3 x 10 ^ -19 J. What's the maximum kinetic energy of the ejected electrons? What's their maximum speed? (Use mass of an electron is 9.11 x 10^ -31 kg.)

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