Question

The 1st electron in the H2 atom is ejected from the atom after absorbing a total amt of Energy = 20.4eV . Calculate its de Broglie wavelenght in A^0

Answer 1

what's the first ionization potential for He?

Answer 2

E = 2.18 * 10^-18 * 2

Answer 3

i think...

Answer 4

but the question asks abt hydrogen

Answer 5

E = 13.62 eV ------ Hydrogen

Answer 6

oh ... i thought i say He ... i think i should get some proper sleep.

Answer 7

do the usual way ...
\[ \Delta E = 20 - 13.6 = 6.4eV \\
\lambda = {h \over p} = {h \over \sqrt{ 2 E }}\]

Answer 8

we have to change eV to jolue.....right

Answer 9

looks like i missed something ... i should really get some sleep.
yes you should