What happens to a RADAR beam once transmitted?

When a radar beam is transmitted, it travels outward in a straight line unless it encounters an object or a medium that influences its path. The statement that the beam is indefinite unless refracted, reflected, or absorbed accurately captures the nature of radar transmission. In an ideal scenario, the radar beam continues to propagate indefinitely in the absence of interference or obstacles.

However, physical conditions or objects can interact with the beam. For instance, refraction occurs when the radar signal passes through different atmospheric layers; reflection happens when it strikes surfaces like vehicles or structures; and absorption may take place when the signal encounters materials that can dissipate the radar energy. Therefore, while the radar beam has the potential to travel indefinitely in clear conditions, various factors can affect its path and integrity, leading to scenarios where its performance might be altered. This makes the assertion that it is indefinite unless disrupted by specific conditions accurate and reflective of how radar operates in practical applications.