Verified Solution • 2025–26 Session moderate

QJEEM19Ph90a0: JEE Main 2019 Physics - Class 12 JEEM19Ph90a0 Solution: In an electron microscope, the resolution that can be achieved…

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 -

Multiple Choice Options

  • A 25 keV
  • B 500 keV
  • C 100 keV
  • D 1 keV

Step-by-Step Verified Solution

λ = hp          {λ = 7.5 × 10−12}

P = hλ

KE = P22m=(h/λ)22m

={6.6×10−347.5×10−12}2×9.1×10−31 J

KE = 25 Kev

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