An electron loses 4.33 x 10^-19 J as it moves from the 2nd to 1st energy level. What is the frequency of light given off by that electron?

An experimental procedure requires a 10 ml of acid to be dissolved

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

Amap that uses a range of colors and shading to represent the elevation, depth, or landscape of specific features on earth is a/an map.