Range activity shall cease whenever a thunderstorm has been detected within how many miles of the launch site?

The correct answer is 10 miles. This is based on safety protocols designed to minimize the risks associated with electric discharges from thunderstorms, which can pose significant hazards during rocket launching activities.

When a thunderstorm is detected within 10 miles of the launch site, the potential for lightning strikes increases, which can not only damage equipment but also pose a danger to individuals present at the site. By adhering to this 10-mile rule, the launch personnel can take necessary precautions to ensure safety, including securing all launch operations, clearing the area, and waiting for the storm to pass.

The range of 10 miles is generally considered a safe distance based on meteorological research and the behavior of thunderstorms, as lightning can strike well ahead of an approaching storm front. Thus, the 10-mile threshold is a critical guideline in ensuring the safety of all involved in rocketry activities during inclement weather conditions.