ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Á½Áмòгºá²¨µÄÕñ·ù¶¼ÊÇ20 cm£¬´«²¥ËٶȴóСÏàͬ¡£ÊµÏß²¨µÄƵÂÊΪ2 Hz£¬ÑØxÖáÕý·½Ïò´«²¥£»ÐéÏß²¨ÑØxÖḺ·½Ïò´«²¥¡£Ä³Ê±¿ÌÁ½Áв¨ÔÚÈçͼËùʾÇøÓòÏàÓö£¬Ôò___¡£
A£®ÔÚÏàÓöÇøÓò»á·¢Éú¸ÉÉæÏÖÏó
B£®ÊµÏß²¨ºÍÐéÏß²¨µÄƵÂÊÖ®±ÈΪ3¡Ã2
C£®Æ½ºâλÖÃΪx£½6 m´¦µÄÖʵãÔÚͼʾʱ¿ÌËÙ¶ÈΪÁã
D£®Æ½ºâλÖÃΪx£½8.5 m´¦µÄÖʵãÔÚͼʾʱ¿ÌλÒÆy£¾20 cm
E£®´Óͼʾʱ¿ÌÆðÔÙ¾¹ý0.25 s£¬Æ½ºâλÖÃΪx£½5 m´¦µÄÖʵãµÄλÒÆy£¼0
¡¾´ð°¸¡¿BDE
¡¾½âÎö¡¿A¡¢Á½Áв¨²¨ËÙÏàͬ£¬²¨³¤²»Í¬£¬¸ù¾Ý£¬ÆµÂʲ»Í¬£¬²»»á·¢Éú¸ÉÉæÏÖÏ󣬹ÊA´íÎó£»
B¡¢Á½Áв¨²¨ËÙÏàͬ£¬²¨³¤·Ö±ðΪ4m¡¢6m£¬Îª2£º3£¬¸ù¾Ý¸ù¾Ý£¬ÆµÂʱÈΪ£¬¹ÊBÕýÈ·£»
C¡¢Æ½ºâλÖÃΪ´¦µÄÖʵã´Ë¿ÌλÒÆΪÁ㣬Á½Áв¨µ¥¶ÀÒýÆðµÄËٶȲ»µÈ£¬Ïà·´£¬¹ÊºÏËٶȲ»ÎªÁ㣬¹ÊC´íÎó£»
D¡¢Æ½ºâλÖÃΪ´¦µÄÖʵ㣬Á½Áв¨µ¥¶ÀÒýÆðµÄλÒÆ·Ö±ðΪ¡¢£¬¹ÊºÏλÒÆ´óÓÚÕñ·ùA£¬¹ÊDÕýÈ·£»
E¡¢´«²¥ËٶȴóСÏàͬ£®ÊµÏß²¨µÄƵÂÊΪ£¬ÆäÖÜÆÚΪ£¬ÓÉͼ¿ÉÖª£ºÐéÏß²¨µÄÖÜÆÚΪ£»´Óͼʾʱ¿ÌÆðÔÙ¾¹ý£¬ÊµÏß²¨ÔÚƽºâλÖÃΪ´¦ÓÚ²¨¹È£¬¶øÐéÏß²¨Ò²´¦ÓÚyÖáÉÏ·½£¬µ«²»ÔÚ²¨·å´¦£¬ËùÒÔÖʵãµÄλÒÆ£¬¹ÊEÕýÈ·¡£