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【简答题】
人在峡谷中呼喊之后，会听到回声，如果从呼喊到听到回声用了5s，则反射声音的峭壁距呼喊者______m远．回声到达人耳的时间比原声晚0.1s，人才能听到自己的回声，则人若要听到自己的回声，人距障碍物至少要______m远．（声音在空气中的传播速度是340m/s）． 运用声纳系统可以探测海洋深度，在与海平面垂直的，声纳向海底发射超声波，如果经4S接受到来自大海底的信号，则该处的______m，（海水中的声速是1500m/s），但是，超声波声纳却不能用于太空测距，（比如地球与月球的距离），这是因为______． ．
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