To give blood you must: 1  Be in general good health.  Be at least 17 years old. (If you are 16 you can donate with a CBC consent form signed by your parent). There is no upper age limit as long as you have no health restrictions.
Specific radiative intensity. Specific (radiative) intensity is a quantity used in physics that describes electromagnetic radiation. It is a term used in much of the older scientific literature. The present-day SI term is spectral radiance, which can be expressed in base SI units as W mâ2 srâ1 Hzâ1.
In general, an Intensity is a ratio. For example, pressure is the intensity of force as it is force/area. Also, density (symbol Ï) is the intensity of mass as it is mass/volume. The Intensity of waves (called Irradiance in Optics) is defined as the power delivered per unit area. The unit of Intensity will be W.m -2. The wave energy comes from the simple harmonic motion of its particles. The total energy will equal the maximum kinetic energy.