For a given accelerating voltage, an electron microscope has a certain theoretical resolution. Suppose that instead of a beam of electrons you used a beam of protons, with the same accelerating voltage. How would this affect the theoretical resolution?

In an avalanche , one electron ,starting at the cathode , multiplies to 1000 over a distance of 10 mm , the ionization :coefficient (a) is 0.56 ionizations /mm 0.69 ionizations/mm 0.2 ionizations/mm O 0.33 ionizations/mm O The number of ionizing collisions on average made by an electron per unit drift : in the direction of the field is called Statistical time lag O Townsends first ionization collision coefficient Townsends second ionization collision coefficient Attachment coefficient

Find the phasor notation of: C(t) DE(t)/at, where E(t) = cos (wt + + 4 sin(wt) £ + [8 cos(wt) – sin(wt)]2.

If an x-ray field is 6 x 8 inches at 40 SID, at what SID would the field measure 15 x 20 inches?