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The electrons are accelerated by voltages in which of the following ranges?

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The electrons are accelerated by voltages in which of the following ranges?

(a) 5 and 50kV

(b) 50 and 500kV

(c) 500 and 5000kV

(d) 25 and 250kV

I have been asked this question by my school principal while I was bunking the class.

My doubt is from Electron Probe Microanalyser topic in portion X-Ray Spectrometers of Analytical Instrumentation

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Correct option is (a) 5 and 50kV

For explanation: The whole system operates in a vacuum. The electrons are accelerated by voltages in the range of 5 and 50kV.

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