"which phenomenon of light explains the separation of light into colors in a rainbow

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =