JEE Main 2019PhysicsDual Nature of MatterMediumMCQ

JEE Main 2019 — Dual Nature of Matter Question with Solution

JEE Main 2019 (10 Jan Shift 1)

Question

In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5×10-12 m, the minimum electron energy required is close to:

Choose an option

Show full solutionCorrect option: B
Correct answer
B25 keV

Step-by-step explanation

λ=150V⇒7.5×10-2=150V

V=1507.5×7.5×10-4=803kV

V≈25 KeV

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About this question

This is a previous-year question from JEE Main 2019, covering the Dual Nature of Matter chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.