本题目来源于试卷: gc textbook chapter 17 Electric Potential，类别为 通用国际物理
[问答题]
An electron is accelerated by k vozr *g.ior4-jma 37ow5 +wgtf1ngh1t wc7:kq uhgk0q- 10ra potential difference of, say, 0.10 V. How much greater would its final speed be if it is acceler7g k:0c tf1 hghqtn1-q1wk0urated with four times as much voltage? Explain.
参考答案:
The potential energy of the
electron is proportional to the voltage used to accelerate it. Thus, if the voltage is multiplied by a
factor of 4, then the potential energy is increased by a factor of 4 also. Then, by energy conservation, we assume that
all of the potential energy is converted to kinetic energy during the
acceleration process. Thus the kinetic
energy has increased by a factor of 4 also.
Finally, since the speed is proportional to the square root of kinetic
energy, the speed must increase by a factor of 2.
本题详细解析:
暂无
| 
