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ESCA gives sufficient chemical information up to a depth about ________ armstrong in oxide.

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ESCA gives sufficient chemical information up to a depth about ________ armstrong in oxide.

(a) 5-20

(b) 15-40

(c) 40-100

(d) 100-200

This question was addressed to me in an internship interview.

My question comes from Electron Spectroscopy for Chemical Analysis topic in chapter Electron and Ion Spectrometers of Analytical Instrumentation

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Right option is (b) 15-40

The best explanation: ESCA gives sufficient chemical information up to a depth about 15-40 armstrong in oxide. ESCA is also known as X-ray photoelectron spectroscopy.

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