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Suppose he work function for a metal used in the cathode of a photoelectric cell is 2.40x10-19 Joules. Calculate the value of the longest wavelength for light that has just sufficient energy to cause the emission of photoelectrons from the surface of this metal. What is the color of this light?

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aabdulsamir

Answer:

8.28.25nm

Explanation:

E = 2.40 * 10 ^-19 J

h = 6.626 * 10^-34 J.S

C = 3.0 * 10^8 m/s

Energy - wavelength relationship is

E = hc / λ

λ = hc / E

λ = (6.626 * 10⁻³⁴ * 3.0*10⁸) / 2.40*10⁻¹⁹

λ = 8.28 * 10⁻⁷m

λ = 828.25nm

the wavelength is 828.25nm

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