1)The minimum frequency of light needed to eject electrons from a metal is called the threshold...

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Chemistry

1)The minimum frequency of light needed to eject electrons froma metal is called the threshold frequency, Î½0. Find the minimumenergy needed to eject electrons from a metal with a thresholdfrequency of 4.55 Ã— 1014 sâ€“1.
2)With what maximum kinetic energy will electrons be ejectedwhen this metal is exposed to light with a wavelength of Î» = 265nm?

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4.0 Ratings (396 Votes)

we know

E = E⁰ + K.E

E⁰ = threshold energy

K.E is kinetic energy

hÎ½ = hÎ½₀ + K.E

minimum energy needed to eject electrons from a metal = hÎ½₀ = 6.625 * 10^-34 J.s * 4.55 * 10¹⁴.s^-1

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 30.14375 * 10^-20J

K.E = hÎ½ - hÎ½₀

Â Â Â Â Â = hc / Î› - (30.14375 * 10^-20J)

Â Â Â Â Â = [(6.625 * 10^-34J.s * 3*10⁸m/s) / 265 * 10^-9m] - (30.14375 * 10^-20J)

Â Â Â Â Â = 44.857 * 10^-20 J

Â Â Â Â

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