Omg please help me. i have no clue.

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

What are two different ways you could find the value of a? explain these methods.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?