After a 680 hour heat treatment at 1130°c the concentration of a is 2.9 wt% at the 3.4 mm position within metal b. at what temperature (in kelvin) must the diffusion couple need to be heated to produce this same concentration at a 1.8 mm position after 680 h? the preexponential and activation energy values for the diffusion of a in b are 2.7 × 10-5 m2/s and 257 kj/mol, respectively.

Which of the following statements comparing electron microscopy and light microscopy is false? which of the following statements comparing electron microscopy and light microscopy is false? both the electron microscope and the light microscope use the same wavelengths for illumination. images produced by light microscopes can be in color, whereas electron microscope images are black and white unless they are artificially colored. the electron microscope has greater resolution than the light microscope. electron microscopes can allow examination of viruses and internal cell structures, whereas light microscopes are limited to objects that are 0.5 micrometers and larger. request answer