Final answer:
The provided references do not contain the necessary information to determine the minimum airspeed for turbojet aircraft below 10,000 feet. An accurate answer cannot be given without the specific regulation or guideline.
Step-by-step explanation:
The question asks about the minimum airspeed to be assigned to arriving turbojet aircraft operating below 10,000 feet. However, the reference information provided pertains to completely different physics problems, such as the Doppler effect experienced during an air show, the unrealistic results of a commercial airplane's travel scenario, and the relativistic treatment of light speed in the context of an airplane's emitted light. These references do not contain the information necessary to ascertain the minimum airspeed for turbojet aircraft under the specified conditions. Therefore, without the precise regulation or guideline that states this minimum speed, it is not possible to provide a correct answer to the question as asked.