Suppose fe satisfactorily evaporates from a surface source, 1 cm2 in area, which is maintained at 1550°c. higher desired evaporation rates can be achieved by raising the temperature 100°c, but this burns out the source. instead, the melt area is increased without raising its temperature. by what factor should the source area be enlarged to achieve equivalent deposition?

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b.what is the wavelength of the wave? c.what is the amplitude of the magnetic field? d.what is the intensity of the wave?