ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾÊÇÑо¿¹âµçЧӦʵÑéµÄ×°Öüòͼ.ÔÚ³é³ÉÕæ¿ÕµÄ²£Á§¹ÜÄÚ£¬KΪÒõ¼«£¨ÓýðÊôï¤ÖƳɣ©·¢Éú¹âµçЧӦµÄÒݳö¹¦Îª1.9 eV£¬AΪÑô¼«.µ±a¡¢b¼ä²»½ÓÈκεçÔ´£¬ÓÃƵÂÊΪ¦Í£¨¸ßÓÚ蘆ļ«ÏÞƵÂÊ£©µÄµ¥É«¹âÕÕÉäÒõ¼«Kʱ£¬»á·¢ÏÖµçÁ÷±íÖ¸ÕëÓÐƫת.ÈôÔÚa¡¢b¼ä½ÓÈëÖ±Á÷µçÔ´£¬a½ÓÕý¼«£¬b½Ó¸º¼«£¬²¢Ê¹a¡¢b¼äµçѹ´ÓÁ㿪ʼÖð½¥Ôö´ó£¬·¢ÏÖµ±µçѹ±íµÄʾÊýÔö´óµ½1.1 Vʱ£¬µçÁ÷±íµÄʾÊý¸ÕºÃ¼õСµ½Á㣨µçÁ÷±íºÍµçѹ±íµÄÁã¿Ì¶ÈÏ߶¼ÔÚ±íÅÌÖÐÑ룬ÒÑÖªÆÕÀʿ˳£Á¿h=6.63¡Á10-34 J¡¤s£©.Ç󣺣¨1£©a¡¢b¼äδ½ÓÖ±Á÷µçԴʱ£¬Í¨¹ýµçÁ÷±íµÄµçÁ÷·½Ïò£»
£¨2£©µ±µçÁ÷±íµÄʾÊý¸ÕºÃ¼õСµ½Áãʱ£¬´ÓÒõ¼«K·¢³öµÄ¹âµç×ÓµÄ×î´ó³õ¶¯ÄÜEkÊǶàÉÙ½¹¶ú£¿ÕâʱÈëÉäµÄµ¥É«¹â²¨³¤ÊǶàÉÙ£¿
£¨3£©Èô½«a½Ó¸º¼«£¬b½ÓÕý¼«£¬µçѹ±íµÄʾÊýΪ2.5 Vʱ£¬¹âµç×Óµ½´ïÑô¼«AµÄ×î´ó¶¯ÄÜΪ¶àÉÙµç×Ó·ü£¿
½â£º£¨1£©¹âµçÁ÷´Óϵ½ÉÏ.
£¨2£©Ek0=eU0=1.1 eV=1.76¡Á10-19 J
ÓÉ°®Òò˹̹¹âµçЧӦ·½³ÌÓÐEk0=h¦Í-W
h¦Í=Ek0+W=(1.1+1.9) eV=4.8¡Á10-19 J
¦Ë= m=4.1¡Á10-7 m.
£¨3£©¹âµç×Óµ½´ïA¼«µÄ×î´ó¶¯ÄÜΪEkA=Ek0+eU=(1.1+2.5) eV=3.6 eV.
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿