Joe和Susan在森林中迷路需要大喊求救。他们两个谁的声音传播的距离更远更容易被听到？


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选材／校对／翻译：hqj5715
During their church choir's annual picnic, Joe and Susan wandered off to explore the surrounding woods. But when they decided to return to the picnic site, they discovered that they couldn't find their way back. They hadn't wandered very far. They were almost sure that they were still within hearing distance of the rest of the group. Which one of them should shout for help? Susan, who was a physicist as well as a soprano in the choir, told Joe that he should shout and she would rest her vocal cords for her next solo. Besides, she explained, Joe's deep bass voice would carry farther because it would send out sound waves with longer wavelengths. Her higher frequency voice, on the other hand, would send out sound waves of shorter wavelengths that wouldn’t carry as far. That's because a sound wave travels only a certain number of wavelengths before it stops. It's as if a person with short legs and a person with long legs were walking at the same speed. The short legged person will take smaller steps but more frequent ones, while the long legged person will take longer, less frequent steps. If both get tired and stop after taking 1,000 steps, the long legged person will have traveled farther.
在教会唱诗班一年一度的野餐期间，joe和susan漫步离开去探索附近的森林。但是当他们决定返回野餐营地时，却发现他们迷路了。他们并没有走很远。 他们十分肯定他们仍在其他队友听力可及的范围之内。 他们当中应该谁来大声叫喊求救呢？ 既是物理学者同样也是唱诗班中女高音的Susan告诉joe他应该求救，而Susan应该让她的声带休息以为下一场独唱做准备。 除此之外，Susan解释说，joe深沉的音调会传的较远，因为他发出的声波具有较长的波长。而另一方面，她自己较高频率的声音，发出的声音波长较短，因此传播的距离较短。 那是因为在声波停止之前其转播一定倍数的波长。这就像一个腿长的人与一个腿短的人以相同的速度走路一样。 腿短的人步伐小但是频率较快，而腿长的人步伐大频率却相对较小。如果两者均在行进1000步之后感觉劳累并停下脚步，腿长的人将会行进较长的距离。