If an airplane squawks 7700, what indication will appear on the radar scope?

When an airplane squawks 7700, it indicates an emergency situation. This transponder code triggers specific alerts in the air traffic control system, particularly on radar scopes. The code 7700 is universally recognized as an emergency squawk code and typically causes "EMRG" or "EM" to appear on the radar display. This indication is not just a one-time flash; it usually continues to flash to grab the attention of air traffic controllers and highlight the urgency of the situation. This allows controllers to prioritize their response and provide the necessary assistance to the aircraft in distress.

In contrast, other options do not accurately represent the meaning of squawking 7700. Displaying flight number and altitude details would indicate normal operations rather than an emergency. Sending an alert to all nearby aircraft is not standard practice for this specific transponder code; while controllers may communicate with nearby aircraft, an immediate visual indication is more critical. Lastly, suggesting no indication would be misleading, as squawking 7700 specifically triggers an urgent alert on the radar system.