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.
The intensity is defined as the power that passes perpendicularly through a surface divided by the area of that surface. API =. Intensity Example: Sound Intensities 12x10 -5 W of sound power passed through the surfaces labeled 1 and 2. The areas of these surfaces are 4.0 m 2 and 12 m 2.