Copper metal has a threshold energy of 7.50×10-19 J. A sample of copper is struck with a photon and an electron is ejected with a kinetic energy of 1.30×10-18 J.
(Planck Constant, h = 6.626 x 10-34 Js. Speed of light in vacuum, c = 3.00 x 108 ms-1)
(i) Calculate the energy of the photon.
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Answer:
don't know the answer sorry
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Explanation:
Energy = threshold energy + kinetic energy
energy = 7.50*10^-19 + 1.30 * 10^ -18
= 20.5 * 10^ -19
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