Final answer:
The appropriate federal authority to notify in the event of a plane crash is the Federal Aviation Administration (FAA), as they oversee civil aviation incidents in the U.S. and investigate such crashes. Other provided options are not applicable.
Step-by-step explanation:
In the scenario where a nurse is responding to the scene of a small plane crash, the appropriate federal authority to notify would be the Federal Aviation Administration (FAA). The FAA has jurisdiction over all civil aviation incidents in the United States, including plane crashes. It is tasked with ensuring air travel safety and would be responsible for investigating the crash. Other options given, such as the National Pizza Delivery Service, the Department of Magic, and the International Clown Association, are not relevant to the situation and do not exist as real federal authorities that deal with aviation incidents.
Emergency services such as fire departments, police departments, and emergency medical services often play a critical role in responding to incidents like plane crashes. These entities are funded by the government through the tax base to provide assistance without additional charge. In certain situations, like the 1918 influenza pandemic, volunteer nurses and organizations like the American Red Cross have historically provided invaluable support to official emergency services.