ÌâÄ¿ÄÚÈÝ
![](http://thumb.1010pic.com/pic3/upload/images/201410/38/982e3f1c.png)
|
¢ÙÈç¹û¸ÃͬѧÓÃÃë±í¼Ç¼µÄʱ¼äÈçͼËùʾ£¬ÔòÃë±íµÄʾÊýΪ
¢ÚÈç¹û¸Ãͬѧ²âµÃµÄgֵƫ´ó£¬¿ÉÄܵÄÔÒòÊÇ
A£®²â°ÚÏß³¤Ê±°ÚÏßÀµÃ¹ý½ô
B£®¿ªÊ¼¼Æʱʱ£¬Ãë±í°´ÏÂÉÔÍí
C£®ÊµÑéÖн«51´ÎÈ«Õñ¶¯Îó¼ÇΪ50´Î
D£®°ÚÏßÉ϶ËδÀι̵ØϵÓÚÐüµã£¬Õñ¶¯ÖгöÏÖËɶ¯£¬Ê¹°ÚÏß³¤¶ÈÔö¼ÓÁË
¢ÛÈç¹ûijͬѧÔÚʵÑéʱ£¬ÓõİÚÇòÖÊÁ¿·Ö²¼²»¾ùÔÈ£¬ÎÞ·¨È·¶¨ÆäÖØÐÄλÖã®ËûµÚÒ»´ÎÁ¿µÃÐüÏß³¤ÎªL1£¨²»¼Æ°ÚÇò°ë¾¶£©£¬²âµÃÖÜÆÚΪT1£ºµÚ¶þ´ÎÁ¿µÃÐüÏß³¤ÎªL2£¬²âµÃÖÜÆÚΪT2£®
¸ù¾ÝÉÏÊöÊý¾Ý£¬¿ÉÇóµÃgֵΪ
A.
4¦Ð2
| ||
T1T2 |
4¦Ð2(L1-L2) | ||||
|
4¦Ð2(L1+L2) | ||||
|
4¦Ð2(
| ||||
L1-L2 |
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
ÔÚ̽¾¿µ¥°ÚÖÜÆÚÓë°Ú³¤¹ØϵµÄʵÑéÖУ¬ÏÂÁÐ×ö·¨±ØÒªµÄ»òÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢°ÚÏß¾¡¿ÉÄÜÑ¡ÔñϸЩµÄ£¬²¢ÇÒ¾¡¿ÉÄܳ¤Ò»Ð©£»°ÚÇòÒª¾¡Á¿Ñ¡ÔñÖÊÁ¿´óЩµÄ£¬Ìå»ýСЩµÄ | B¡¢°Ú³¤Îª°ÚÏß³¤Óë°ÚÇò°ë¾¶Ö®ºÍ£¬°Ú³¤²âÁ¿Ö»ÐèÒªÓõ½¿Ì¶È³ß | C¡¢²âÁ¿°ÚÇòÖÜÆÚʱ£¬¼ÆʱÆðµãӦѡÔñ°ÚÇòµ½´ï×î´óλÒÆ´¦Ê±¿ªÊ¼¼Æʱ | D¡¢°Ú¶¯ÖаÚÇòÕñ·ù²»Ò˹ý´ó£¬·ñÔò°ÚµÄÕñ¶¯²»ÔÙÊǼòгÔ˶¯ |
![](http://thumb.1010pic.com/pic3/upload/images/201404/173/8a84facc.png)
A¡¢ÕñÔ´Õñ¶¯µÄƵÂÊΪ4Hz | B¡¢ÈôÖʵãa±ÈÖʵãbÏȻص½Æ½ºâλÖã¬Ôò²¨ÑØxÖḺ·½Ïò´«²¥ | C¡¢¾¹ý0.5S£¬Öʵãcͨ¹ýµÄ·³ÌΪ75cm | D¡¢Í¼Ê¾Ê±¿ÌÖʵãA¡¢B¡¢CËùÊܻظ´´óÁ¦´óС֮±ÈΪ2£º1£º3 | E¡¢t=0.5sʱ¿Ì£¬ÖʵãaµÄλÒÆΪ-10cm |