Final answer:
The question is confusing a medical procedure with a physics problem. For a 3 projection wrist, one would typically assess the anatomy of the wrist using radiographic imaging. The example provided is about calculating IR radiation intensity from a heater, which is a physics-related concept.
Step-by-step explanation:
The question seems to be a mix-up between medical imaging procedures and an example involving the calculation of intensity of IR (Infrared) radiation. When discussing a 3 projection wrist, it typically refers to a series of radiographic images taken from different angles to assess the anatomy of the wrist. These images allow for a comprehensive evaluation of the wrist bones, joints, and surrounding tissues. However, when referring to the provided example, it involves understanding of physics, specifically concerning the transfer of energy via IR radiation from a heater to another object.
To calculate the intensity of IR radiation projected by a concave mirror from a heating element, you'll need to consider the total power output of the element, the area over which the IR radiation is distributed, and the efficiency or proportion of the power that is reflected by the mirror. Given that the heater radiates 1500W, with half of that power being focused by the mirror, and the area of the heating element is 100 cm², you can calculate the intensity at a given distance from the mirror.