When you perform an experiment it is important the measurements are accurate what determines the accuracy of a measurement? a. how close it is to the actual value. b. the number of times that it is repeated. c. the ability of other people to reproduce the measurement. d. wether the results of an experiment match the predicted results.

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 =