Question

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at :

• A. 1035 nm
• B. 325 nm
• C. 743 nm
• D. 518 nm

Answer 1

Answer: (C)

743 nm

Answer 2

E = E1 + E2

$\frac { 1 } { \lambda } = \frac { 1 } { \lambda _ { 1 } } + \frac { 1 } { \lambda _ { 2 } }$

$\frac { 1 } { 355 } = \frac { 1 } { 680 } + \frac { 1 } { \lambda _ { 2 } }$

$\lambda$2 = 742.76 nm.