Which statements are true? Explain why or why not.

$9-1$ A fluorescent molecule, having absorbed a single photon of light at one wavelength, always emits it at a longer wavelength.

$9-2$ Transmission electron microscopy and scanning electron microscopy can both be used to examine a structure in the interior of a thin section: transmission electron microscopy provides a projection view, while scanning electron microscopy captures electrons scattered from the structure and gives a more three$-$dimensional view.