Correct Option (b)
Radar technology utilizes radio waves for detecting objects and determining their characteristics such as movement, size, and speed. Among the given activities, radar can be effectively employed in two of them:
- Monitoring of precipitation (Activity 2): Weather radars are specifically designed to detect various forms of precipitation, including raindrops, hail, and snow. They provide crucial data on precipitation intensity, distribution, and the movement of weather systems, aiding in meteorological forecasting and storm tracking.
- Tracking the migration of animals (Activity 3): Specialized aerobiological radars are used to monitor the movement and migration patterns of animals, particularly birds, bats, and large insects. These radars can provide information on flight altitude, trajectories, and population densities, contributing to ecological studies and conservation efforts.
Incorrect Options
Identification of narcotics on passengers at airports or in aircraft (Activity 1) typically does not involve radar technology. This activity primarily relies on other detection methods such as X-ray scanners, millimetre-wave imaging systems, CT scanners, and chemical trace detectors, which are designed to identify concealed items or specific chemical compounds. Since radar is applicable to only two of the three activities, options (a) Only one, (c) All three, and (d) None are incorrect.