E_n = - R_H \left( {\frac{1}{{n^2 }}} \right) = \frac{{ - 2.178 \times 10^{ - 18} }}{{n^2 }}joule
% MathType!MTEF!2!1!+- % feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqr1ngB % PrgifHhDYfgasaacH8YjY-vipgYlh9vqqj-hEeeu0xXdbba9frFj0- % OqFfea0dXdd9vqai-hGuQ8kuc9pgc9q8qqaq-dir-f0-yqaiVgFr0x % fr-xfr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyram % aaBaaaleaacaWGUbaabeaakiabg2da9iabgkHiTiaadkfadaWgaaWc % baGaamisaaqabaGcdaqadaqaamaalaaabaGaaGymaaqaaiaad6gada % ahaaWcbeqaaiaaikdaaaaaaaGccaGLOaGaayzkaaGaeyypa0ZaaSaa % aeaacqGHsislcaaIYaGaaiOlaiaaigdacaaI3aGaaGioaiabgEna0k % aaigdacaaIWaWaaWbaaSqabeaacqGHsislcaaIXaGaaGioaaaaaOqa % aiaad6gadaahaaWcbeqaaiaaikdaaaaaaOGaamOAaiaad+gacaWG1b % GaamiBaiaadwgaaaa!5409!
Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.
