Which of the Following,in Which N and M Have Integer $$\frac { 1 } { \lambda } = R _ { \mathrm { H } } \left( m ^ { 2 } - n ^ { 2 } \right)$$

Multiple Choice

Which of the following,in which n and m have integer values,is a correct formula for a wavelength emitted by a hydrogen atom?

A) $$\frac { 1 } { \lambda } = R _ { \mathrm { H } } \left( m ^ { 2 } - n ^ { 2 } \right)$$
B) $$\frac { 1 } { \lambda } = R _ { \mathrm { H } } \left( m ^ { 2 } - \frac { 1 } { n ^ { 2 } } \right)$$
C) $\frac { 1 } { \lambda } = R _ { \mathrm { H } } \left( \frac { 1 } { n ^ { 2 } } - m ^ { 2 } \right)$
D) $\frac { 1 } { \lambda } = R _ { \mathrm { H } } \left( \frac { 1 } { m } - \frac { 1 } { n } \right)$
E) $\frac { 1 } { \lambda } = R _ { \mathrm { H } } \left( \frac { 1 } { m ^ { 2 } } - \frac { 1 } { n ^ { 2 } } \right)$