What frequency of light would cause the electron of a Li 2+ ion to be ejected from the 1s orbital?
What frequency of light would cause the electron of a Li 2+ ion to be ejected from the 1s orbital? The energy needed to remove this electron is 1.96 × 10−17 J.
a. 3.38 × 10−17 s−1
b. 2.96 × 1016 s−1
c. −2.96 × 1016 s−1
d. 10.1 s−1
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Planck Relationship
E = h×ν = h×c/λ
E in J; ν = frequency (Hz s-1); λ = wavelength in m
Planck constant h = 6.626×10^-34 J s; c = speed of light = 2.998×10^8 m s-1
ν = E/h
ν = (1.96×10^-17)/(6.626×10^-34) = 2.96×10^16 s^-1 (Hz)