What is the frequency of light released when an electron moves from the 2nd energy level to the 1st energy level in hydrogen (don't reach for a calculator, you should be able to estimate 3/4s of a
number like 3.3).

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.