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 of sound wave (I) at a point is defined as the amount of sound energy (Q) flowing per second per unit area held normally at the point to the direction of the propagation of the sound wave. The intensity of sound definition is represented as. where P = pressure of sound, A = Area.