White light is what the eye sees when wavelengths of all colours reach the eye.
It is a combination of Red, Blue and Green wavelengths of light, that is perceived as white.
Mass = Density x Volume
Mass = 3.2g/mL x 5 mL
Mass = 16g
180 km/s V= 25
explanation: i had the same assignment
Yes a physical change can do that. A chemical change is like a burning candal