An Electron Microscope Operates with Electrons of Kinetic Energy 100

question 11

Multiple Choice

An electron microscope operates with electrons of kinetic energy 100 keV.What is the wavelength of these electrons? Assume this speed is not relativistic.(h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J,and m_e = 9.11 × 10−³¹ kg)

• A) 5.49 × 10−¹² m
• B) 7.14 × 10−¹¹ m
• C) 9.28 × 10−¹⁰ m
• D) 3.88 × 10−¹² m

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Definitions:

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