2012年高考物理试卷(北京)(空白卷)
2012年北京市高考物理试卷一、选择题1.(3分)一个氢原子从n=3能级跃迁到n=2 能级,该氢原子()A.放出光子,能量增加B.放出光子,能量减少C.吸收光子,能量增加D.吸收光子,能量减少2.(3 分)一束单色光经由空气射入玻璃,这束光的()A.速度变慢,波长变短B.速度不变,波长变短C.频率增高,波长变长D.频率不变,波长变长3.(3分)一个小型电热器若接在输出电压为10V的直流电源上,消耗电功率为P;若把它接在某个正弦交流电源上,其消耗的电功率为0.5P,如果电热 器电阻不变,则此交流电源输出电压的最大值为()A.5VB.C.10VD.4.(3分)处于匀强磁场中的一个带电粒子,仅...
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