What is the wavelength of EM radiation with the frequency equal to 1.9×10¹⁵ 1/s?

What was the procedure by which case united states vs lopez went to court

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

This drawing shows a human body system. what is the primary function of this body system?