Find the work function of an electron from the surface of some material, if, when this material is irradiated with yellow

| April 10, 2021 | education

Find the work function of an electron from the surface of some material, if, when this material is irradiated with yellow light, the speed of the knocked out electrons is 0.28 * 10 ^ 6m \ s. The wavelength of yellow light is 590nm.

Task data: Ve – the speed of the knocked-out electrons (Ve = 0.28 * 10 ^ 6 m / s); λl – yellow wavelength (λl = 590 nm = 59 * 10 ^ -8 m).

Const: h – Planck’s constant (h = 6.62607 * 10 ^ -34 J * s); me is the mass of an electron (me = 9.11 * 10 ^ -31 kg); C – the speed of propagation of light (C = 3 * 10 ^ 8 m / s).

To find out the work function of an electron, consider the formula: Aout = h * ν – Ek – = h * C / λzh – 0.5 * me * Ve2.

Let’s perform the calculation: Aout = h * C / λzh – 0.5 * me * Ve2 = 6.62607 * 10-34 * 3 * 10 ^ 8 / (59 * 10 ^ -8) – 0.5 * 9.11 * 10 ^ -31 * (0.28 * 10 ^ 6) 2 ≈ 3.012 * 10 ^ -19 J.

Answer: The work function, according to the calculation, is 3.012 * 10 ^ -19 J.



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