a) 15eV
b) 15keV
c) 30eV
d) 30keV
Answer: b
Explanation: Energy of an electron is upto 15keV in electron beam heating. Electron beam heating allows tight control of the evaporation rate and although more expensive, it is notably simpler and much more versatile as it can be used to evaporate many different materials. It must be ensured that no secondary electrons impinge on the polymeric web.
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