The use of light sources or sound sources at night can determine the distance, according to the average person's hearing:
1. Within a kilometer, the cigarette light can be seen.
2. Within 1km and a half, you can see the fire of the matchstick and the light of the flashlight.
3. Within 2 km, rifle fire can be seen.
4. Within half a kilometer you can hear people talking normally.
5. Within 1 km, people can hear shouts and hoofs.
6. Within 1 km and a half, you can hear the car driving.
7. Within 2 km, car horns and horses can be heard.
8. Gunfire can be heard within 5 km.
9. The sound of the aircraft can be heard within 8 km or 12 km.
1. Within a kilometer, the cigarette light can be seen.
2. Within 1km and a half, you can see the fire of the matchstick and the light of the flashlight.
3. Within 2 km, rifle fire can be seen.
4. Within half a kilometer you can hear people talking normally.
5. Within 1 km, people can hear shouts and hoofs.
6. Within 1 km and a half, you can hear the car driving.
7. Within 2 km, car horns and horses can be heard.
8. Gunfire can be heard within 5 km.
9. The sound of the aircraft can be heard within 8 km or 12 km.
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