Question

PRE-LABORATORY QUESTIONS (For full credit show your calculations) 1. List the expected color of light and the corresponding wavelength (nm) associated with each cation (use Table 1) Rubidium, Rb Cesium, Cs 2. Calculate the energy associated with the light emitted by each of the elements above (sue equations 1 and 2) Rubidium, Rb Cesium, Cs

Answer 1

Question 1.

Rb⁺ = pale violet color, wave length ($\lambda$) = 406 nm

Cs⁺ = pale violet color, wave length ($\lambda$) = 403 nm

Question 2.

Rb⁺: E = hc/$\lambda$ = 6.625*10^-34 J.s * 3*10⁸ m.s^-1/(406*10^-9 m) = 4.895*10^-19 J

Rb⁺: E = hc/$\lambda$ = 6.625*10^-34 J.s * 3*10⁸ m.s^-1/(403*10^-9 m) = 4.932*10^-19 J