9. The emission spectrum of cesium contains two lines whose frequencies are (a) 3.49
and (b) 6.53 x 10" Hz. What are the wavelengths and energies per photon of the two. What color are the lines?

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

Areaction in which products can react to re-form reactants is

Suppose that a certain fortunate person has a net worth of $71.0 billion ($7.10×1010). if her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth?