What is the speed of motion of an electron if the work function is 130 * 10 ^ -19 C

univerkov | June 25, 2021 | education

What is the speed of motion of an electron if the work function is 130 * 10 ^ -19 C, and the photon energy is 350 * 10 ^ -19 J?

To determine the value of the speed of motion of the indicated electron, we use the formula: Eph = Avykh + me * V2 / 2, from where we express: V = √ (2 * (Eph – Avykh) / me).

Variables and constants: Eph – photon energy (Eph = 350 * 10-19 J); Avykh – work function (Avykh = 130 * 10-19 J); me is the mass of an electron (me = 9.11 * 10-31 kg).

Let’s perform the calculation: V = √ (2 * (Eph – Avykh) / me) = √ (2 * (350 * 10-19 – 130 * 10-19) / (9.11 * 10-31)) = 6949717 m / s ≈ 6950 km / s.

Answer: The speed of the indicated electron is 6950 km / s.

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