Final answer:
The 10 code for requesting an ambulance is 10-52, used by emergency services to communicate the need for medical assistance quickly over the radio.
Step-by-step explanation:
The 10 code for requesting an ambulance in emergency communications is 10-52. When a police officer, firefighter, or other emergency service personnel uses this code over the radio, they are indicating the need for an ambulance. It's part of a standardized system of codes, known as ten-codes or ten-signals, that helps to convey information efficiently and concisely over radio frequencies.