Physical problems: Mountaineers are not allowed to shout loudly when climbing on the snow-capped mountains, and can only exchange information with gestures. This is because.

1. Because the air in the mountains is thin. We know that sound needs media to spread. At the top of the mountain, the air is thin, so sound doesn't spread easily. If you shout loudly on the mountain, it is not easy for the other party to hear, and the light does not need medium to spread. You can use gestures.

2. Prevent avalanches. Because sound propagation is caused by air vibration. If the Chinese dialect is loud, it will cause the nearby air to vibrate, which will cause the vibration when snow comes into contact with the air, and the slight vibration of snow may cause an avalanche.