The standard minimum cage size recommended by bird professionals is 12- by 18- by 18-inches for a single bird. This cage size is fine if your budgie is outside of the cage most of the time, but if you have a cage-confined budgie, it's going to be much too small to keep your bird happy and healthy.For two budgies, 39- by 20- by 32-inches is a recommended size.ousing your budgie is an important aspect of his care requirements. The size is one of the most important things to look at when setting up your little guy's cage.
Differences between Optical and Radio Astronomy. There are many differences between optical and radio astronomy. The three main differences are the design of the instruments, the resulting data that is found, and the different sources that are seen. Both optical and radio astronomy use telescopes; however, there is a big difference in the design between an optical telescope and a radio telescope. Optical astronomy is the study of the visible part of the electromagnetic spectrum, that is wavelengths of approximately 400 nm (purple) to 700 nm (red). Radio wavelengths are much longer; the radio spectrum ranges from approximately one millimeter to hundreds of meters.
Optical spectroscopy is the science that is concerned with the interaction of optical electromagnetic radiation with matter. In many cases, this interaction involves specific transitions between energy levels (states) and is experimentally observed by the absorption or emission of electromagnetic radiation.In these types of interaction, the radiation is considered to be composed of discrete packets of energy called photons.he magnitude of the optical signal as a function of wavelength encodes the chemical information about the species. Two systems describe such intensities: the radiometric system, which is now almost exclusively used in optical spectroscopy, and the photometric system, which is based upon the response of the human eye.