An electron microscope employs which one of the following principles?
Correct answer: D. All of the above
- A. Electrons have a wave nature
- B. Electrons can be focused by an electric field
- C. Electrons can be focused by a magnetic field
- D. All of the above
Explanation
To summarize, electron microscopes utilize the wave nature of electrons, employ electric fields for focusing, and also use magnetic fields for precise control of the electron beam, making them powerful tools for studying the microscopic world.
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About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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