To be considered as open source software by the software development industry, certain criteria must be met: The program must be freely distributed (It can be part of a package that is sold though, such as Red Hat has done with Linux in the example below).
The term broad-spectrum antibiotic refers to an antibiotic that acts against a wide range of disease-causing bacteria. A broad-spectrum antibiotic acts against both Gram-positive and Gram-negative bacteria, in contrast to a narrow-spectrum antibiotic, which is effective against specific families of bacteria. An example of a commonly used broad-spectrum antibiotic is ampicillin.
Visible spectrum. The visible spectrum is a very small portion of the electromagnetic spectrum that can be seen by human eyes. This is shown in the figure below, which is not to scale. The exact boundaries of each type of wave are not precisely defined and often different authors have slightly different values.he limit between ionizing and non-ionizing radiations is located somewhere in the UV region, but it's not clearly defined and somehow fuzzy. A photon energy of 10 eV (corresponding to 124 nm) is often considered the threshold between ionizing and non-ionizing radiation, but there is no consensus on this topic.