2014北京市石景山区高考物理一模试题及答案解析

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13．根据玻尔理论，氢原子的电子由n=1轨道跃迁到n=2轨道，下列说法正确的是A．原子要吸收某一频率的光子

B．原子要放出一系列频率不同的光子

C．原子的能量增加，电子的动能增加

D．原子的能量减少，电子的动能减少

14．关于红光和绿光，下列说法正确的是

A．红光的频率大于绿光的频率

B．在同一玻璃中红光的速率小于绿光的速率

C．用同一装置做双缝干涉实验，红光的干涉条纹间距大于绿光的干涉条纹间距

D．当红光和绿光以相同入射角从玻璃射入空气时，若绿光刚好能发生全反射，则红光也一定能发生全反射

15．下列说法正确的是

A．布朗运动是液体分子的无规则运动

B．布朗运动是指液体中悬浮颗粒的无规则运动

C．温度降低，物体内每个分子的动能一定减小

D．温度低的物体内能一定小

16．甲、乙两颗人造卫星绕地球作圆周运动，半径之比为R1:R2=1:4，则它们的运动周期之比和运动速率之比分别为

A．T1:T2=8:1，v1:v2=2:1 B．T1:T2=1:8，v1:v2=1:2

C．T1:T2=1:8，v1:v2=2:1 D．T1:T2=8:1，v1:v2=1:2

17．右图是一列沿着x轴正方向传播的横波在t=0时刻的波形图。已知这列

A．这列波的波速v=2.0m/s

B．在t=0时，x=0.5m处的质点速度为零

C．经过2.0s，这列波沿x轴正方向传播0.8m

D．在t=0.3s时，x=0.5m处的质点的运动方向为y轴正方向

18．如图所示，L1、L2是高压输电线，图中两电表示数分别是220V和10A。已知甲图中原、副线圈匝数比为100:1，乙图中原副线圈匝数比为1:10，则

A．甲图中的电表是电压表，输电电压为2200 V

B．甲图中的电表是电流表，输电电流是100 A

C．乙图中的电表是电压表，输电电压为22000 V

D．乙图中的电表是电流表，输电电流是100 A

19．利用传感器和计算机可以研究快速变化的力的大小。实验时，把图甲中的小球举高到绳

子的悬点O 处，然后小球由静止释放，同时开始计时，利用传感器和计算机获得弹性绳的拉力随时间的变化如图乙所示。根据图像提供的信息，下列说法正确的是

A ．t 1、t 2时刻小球的速度最大

B ．t 2、t 5时刻小球的动能最小

C ．t 3、t 4时刻小球的运动方向相同

D ．t 4

- t 3

< t 7

- t 6

20．如图所示，a 、b 是边界范围、磁感应强度大小和方向都

相同的两个匀强磁场区域，a 的下端离水平地面的高度比b 高一些。甲、乙是两个完全相同的闭合正方形导线框，分别位于a 、b 的正上方，两线框的下端离地面的高度相同。两线框由静止同时释放，穿过磁场后落到地面，下落过程中线框平面始终保持与磁场方向垂直。下列说法正确的是 A ．乙线框先落地 B ．两线框同时落地

C ．穿过磁场的过程中，乙线框产生的热量较少

D ．穿过磁场的过程中，两线框产生的热量相同 21．（共18分）

小灯泡灯丝的电阻随温度的升高而变大，某同学利用实验探究这一现象。所提供的器材有：

a 乙乙

1 F

F F 甲

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2014北京海淀区高三一模英语(Word解析版)

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