Wavenumber Wavenumber In the physical sciences, the wavenumber (also wave number or repetency) is the spatial frequency of a wave, measured in cycles per unit distance or radians per unit distance. Whereas temporal frequency can be thought of as the number of waves per unit time, wavenumber is the number of waves per unit distance. In multidimensional systems, the wavenumber is the magnitude of the wave vector. The space of wave vectors is called reciprocal space. Wave numbers and wave vectors play an essential role in optics and the physics of wave scattering, such as X-ray diffraction, neutron diffraction, and elementary
Control of Vibration at Work Regulations 2005 is the maximum amount that an employee can be exposed to in a day. The values are measured using a formula which works out the average (A) exposure over an 8-hour day. The values are therefore written as A(8). The rate of vibration of a tool or piece of machinery is then measured in metres (m) per second (s) and written as m/s². In order to help employers calculate the exposure levels using the formula, the Health and Safety executive created an exposure calculator. Regulation 5 requires any employer who exposes employees to risk from vibration to make a 'suitable