Plz explain its answer..
Request you to focus on NCERT syllabus only. Don't spend time on stuff beyond NCERT syllabus at this time.
Explanation just in case: Wavelength λk is independent of the accelerating voltage (V), while the minimum wavelength λc is inversely proportional to V. Therefore as V increases, λk remains unchanged whereas λc decreases or λk−λc will increase.
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