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

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

experimentx · Answer

what's the first ionization potential for He?

anonymous · Answer

E = 2.18 * 10^-18 * 2

anonymous · Answer

i think...

anonymous · Answer

but the question asks abt hydrogen

anonymous · Answer

E = 13.62 eV  ------ Hydrogen

experimentx · Answer

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

experimentx · Answer

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

anonymous · Answer

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

experimentx · Answer

looks like i missed something ... i should really get some sleep.|dw:1345449467181:dw|
yes you should