Photons may occur in the form of x-rays, gamma rays, or quanta of light. The energy (E) of a photon is expressed as the product of its frequency (v) and Planck's constant (h), as in the equation E = hv. X-ray photons occur in frequencies of 10 18 to 10 21 Hz and energies that range upward from 1 KeV.
Confidence votes 52.5K. In the US, the standards called General Industry Standards are the OSHA standards at 29 CFR 1910 and are sometimes called Part 1910.
Published in 2009, the Gross Areas Standard is the industryâs first direct measure of the physical size of a building. Gross Areas of a Building: Standard Methods of Measurement (ANSI/BOMA Z65.3â2009) details procedures for measuring construction gross area and exterior gross area of buildings. Both methods can be applied to new and existing buildings, single or multiple stories, owner-occupied or leased, and for all types of occupancies and uses.