Biological specimens are often examined by microscopy. However, microscopy with visible light is limited to viewing details of a specimen on the order of the wavelength of light (400 nm). The macromolecules that make up the cell are much smaller, often about 2-10 nm in size, and the interatomic bonds that make up the molecular structure are about 0.2 nm in length. One method that can be used to reveal the atomic-level details of biological molecules is electron microscopy, in which a beam of electrons is focused onto a biological sample. Modern electron microscopes can emit a beam of electrons with a velocity of 1.5×108m/s. What is the wavelength of an electron particle in this beam?