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Energy of an electron is upto ______ in electron beam heating.

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in Food Packaging Technology by (63.0k points)
Energy of an electron is upto ______ in electron beam heating.

(a) 15eV

(b) 15keV

(c) 30eV

(d) 30keV

This question was addressed to me during an interview.

The above asked question is from Blending and Vapor Deposition in Thermoplastics topic in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Correct answer is (b) 15keV

For 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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