Editing Diffraction-limited system (section)

==Other waves==
The same equations apply to other wave-based sensors, such as radar and the human ear.

As opposed to light waves (i.e., photons), massive particles have a different relationship between their quantum mechanical wavelength and their energy. This relationship indicates that the effective [[De Broglie wavelength|"de Broglie" wavelength]] is inversely proportional to the momentum of the particle. For example, an electron at an energy of 10&nbsp;keV has a wavelength of 0.01&nbsp;nm, allowing the electron microscope ([[Scanning electron microscope|SEM]] or [[Transmission electron microscopy|TEM]]) to achieve high resolution images. Other massive particles such as helium, neon, and gallium ions have been used to produce images at resolutions beyond what can be attained with visible light. Such instruments provide nanometer scale imaging, analysis and fabrication capabilities at the expense of system complexity.