Problem: What is the threshold frequency ν0 of cesium? Note that 1 eV (electron volt) = 1.60 × 10−19 J. Express your answer numerically in hertz.

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We´re asked to determine the threshold frequency νo of Cesium (Cs) in Hertz (Hz), given that 1 eV = 1.60x10-19 J.


Remember that the threshold frequency is related to the Photoelectric effect, and is the minimum frequency of a photon that is needed to hit the surface of a metal or atom to release an electron.

In other words, a photon hits the Cs atom and it transfers its energy to an electron, which in turn is released.

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What is the threshold frequency ν0 of cesium? Note that 1 eV (electron volt) = 1.60 × 10−19 J. Express your answer numerically in hertz.