A light with wavelength 460 nm falls on a pair of closely separated slits. The first dark fringe of the interference pattern is at an angle theta = 3.5 degrees from the central maximum.

a) Express the separation between the slits in terms of theta and lambda.
b) Solve for the numerical value of d in mm.

Gunpowder residue is most likely to show up where on a shooters hands

The speed of light can be used to measure the

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 =