Calculate the wavelength of second line of brackett series of a spectrum of hydrogen carbon​

Define a is a tiny pavket of energy

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n

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.