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.
Intensity of physical activity. Intensity refers to the rate at which the activity is being performed or the magnitude of the effort required to perform an activity or exercise.It can be thought of How hard a person works to do the activity. The intensity of different forms of physical activity varies between people.onsequently, the examples given below are provided as a guide only and will vary between individuals. Intensity refers to the rate at which the activity is being performed or the magnitude of the effort required to perform an activity or exercise. It can be thought of  How hard a person works to do the activity .