Công thoát của êlectron khỏi một kim loại là A = 3 , 3.10 − 19 J . Giới hạn quang điện của kim loại này là bao nhiêu A. 0,6 m m B. 6 m m C. 60 m m D. 600 m m
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The threshold wavelength of the metal can be calculated using the formula λ = hc / Φ, where h is the Planck constant, c is the speed of light, and Φ is the work function. Plugging in the values, we have λ = (6.626 x 10^-34 * 3 x 10^8) / 3.3 x 10^-19 = 6 x 10^-7 m = 600 nm. Therefore, the threshold wavelength of the metal is 600 nm, which corresponds to visible light.

The formula for the stopping potential in the photoelectric effect is V = h*f - Φ, where h is the Planck constant, f is the frequency of incident light, and Φ is the work function. Therefore, V = hc/λ - Φ, where c is the speed of light, λ is the wavelength of light. From V = A/e, we can solve for λ to find the threshold wavelength.

The work function can be calculated as the product of the stopping potential (V) and the charge of an electron (e). Therefore, A = eV, which gives V = A/e = 3.3 x 10^-19 / 1.6 x 10^-19 = 2.0625 V.

The kinetic energy of an electron escaping from a metal surface is equal to the work function of the metal. Therefore, the work function of the metal is A = 3.3 x 10^-19 J.