The wavelength of K α line in copper is 1.5 overseto mathop textA . The ionization energy of K electron in copper is

Question

The wavelength of K α line in copper is 1.5 overseto mathop textA . The ionization energy of K electron in copper is (A)  11.2× 10-17J  (B)  12.9× 10-16J  (C)  1.7× 10-15J  (D)  10× 10-16J

Tardigrade Admin · Accepted Answer

Required ionisation energy =(hc/λ ) =(6.6× 10-34× 3× 108/1.54× 10-10) =12.9× 10-16J

Q. The wavelength of $K_{α}$ line in copper is 1.5 $A o$ . The ionization energy of K electron in copper is

$11.2 \times 10^{- 17} J$

$12.9 \times 10^{- 16} J$

$1.7 \times 10^{- 15} J$

$10 \times 10^{- 16} J$

Required ionisation energy $= \frac{h c}{λ}$
$= \frac{6.6 \times 10 ^{- 34} \times 3 \times 10 ^{8}}{1.54 \times 10 ^{- 10}}$
$= 12.9 \times 10^{- 16} J$

Q. The wavelength of Kα​ line in copper is 1.5 Ao . The ionization energy of K electron in copper is

11.2×10−17J

12.9×10−16J

1.7×10−15J

10×10−16J