In place of a beam of light, what does an electron microscope send through the specimen area?
AA beam of electrons
BA beam of protons
CA stream of water
DA burst of sound waves
Answer & Solution
Correct answer: A. A beam of electrons
1. The name of the instrument gives the answer: electron microscopes use a beam of electrons instead of a beam of light.
2. Electrons have short wavelengths, which allows higher magnification and higher resolving power.
3. Protons, water, and sound play no part in either kind of microscope.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_
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