Final answer:
The family from England is unable to listen to the same long-wave radio broadcasts in France because the lower frequency and longer wavelength of these signals limit their range and ability to penetrate obstacles.
Step-by-step explanation:
The family from northern England is unable to listen to the same long-wave radio broadcasts in France because long-wave radio signals have a limited range due to their lower frequency.
Long-wave radio signals, also known as AM radio, have a wavelength longer than 1,000 meters. They can travel longer distances, but their ability to penetrate obstacles, such as buildings and mountains, is limited. Hence, the family is unable to receive the long-wave radio broadcasts from their home country when they are in France.