问题
选择题
如图所示，在B处有一观察者，他和山崖CD间的A处有一爆破点A。当A处发生爆炸，观察者看到爆炸闪光后经过1.5s听到了第一次爆炸声，又过了2s后听到了第二次爆炸声，已知声音在空气中传播速度是340m/ s，则
A．BD间距离为850m
B．AB间距离为255m
C．BD距离为1190m
D．AD间距离为680m
答案
答案：A
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如图所示，在B处有一观察者，他和山崖CD间的A处有一爆破点A。当A处发生爆炸，观察者看到爆炸闪光后经过1.5s听到了第一次爆炸声，又过了2s后听到了第二次爆炸声，已知声音在空气中传播速度是340m/ s，则
A．BD间距离为850m
B．AB间距离为255m
C．BD距离为1190m
D．AD间距离为680m
答案：A
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