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.
light intensity is the sum of each photon's energy arriving in a particular area in a particular time period. the energy of each photon is inversely proportional to its wavelength. If you are talking about luminous intensity then you need to weight the sum-see http://en.wikipedia.org/wiki/Luminous_in...