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shadowfurion

the electron in hydrogen atom is given by E = (- 21.7 x 10 ^{-12 divided by} n ² ) ergs. Calculate the energy required to remove an electron completely from the n = 2 orbit . what is the longest wave length ( in cm?s ) of light that can be used to cause this transition.

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jatinroxx

The question is simple...

Everything is in the question

Substitute n = 2.

That is the energy required.

And lambda = h/p = h/(2mE)^1/2

iitkgp_bipin

Removing completely means sending the electron to n=

E = - 21.7 x 10 ^-12(1/

² - 1/2²)
E = 21.7 x 10 ^-12/2²

For longest wavelength you have to find the minimum energy required for excitation:

hc/

= - 21.7 x 10 ^-12(1/3² - 1/2²)

Now you can calculate

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