The Si- ion is stable with respect to the neutral atom and an electron. This is...
The Si- ion is stable with respect
to the neutral atom and an electron. This is evident in the value
of the electron affinity of silicon which is
133.6 kJ mol-1. What is the longest
wavelength of light that could remove an electron from a
Si- ion? In which region of the
electromagnetic spectrum does this light fall?
Wavelength = ? nm
Region = ____?_____ultra violet/visible/infrared
Homework Answers
energy of one mole photon = NA * h c / wavelength
or
133.6 * 1000 = 6.023 * 10^23 * 6.626 * 10^-34 * 3.0 * 10^8 / wavelength
or
wavelength = 8.96 * 10^-7 m = 896 * 10^-9 m = 896 nm
thus
longest wavelength of light = 896 nm
896 nm fall in 800-1400 nm range.
Hence
Region = infrared
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