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De Broglie Waves - Questions and Answers

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1. The de Broglie wavelength of an electron of kinetic energy 500 e V is
A. 54.92 Å
B. 0.5492 Å
C. 5492 Å
D. 5.492 Å
Explanation:
2. In electron microscope, the electron beam is focused by varying the
A. wavelength of electron
B. current through the emerging coil
C. velocity of electron
D. thickness of colloidal film
Explanation:
3. Einstein’s mass-energy relation is
A. E = mc
B. E = mc2
C. E = m2c
D. E = m2c2
Explanation:
4. The special feature of an electron microscope is its
A. high resolving power
B. compactness
C. low cost
D. resolving power being equal to that of an optical microscope
Explanation:
5. Electron microscope works in
A. vacuum
B. atmospheric pressure
C. very high pressure
D. any pressure
Explanation:
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