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:

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:, 100 k e V, 25 k e V, 1 k e V, 500 k e V

MARKS App · Accepted Answer

λ = 150 V ⇒ 7.5 × 10 - 2 = 150 V V = 150 7.5 × 7.5 × 10 - 4 = 80 3 k V V ≈ 25 K e V

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