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 a potensdw c8n;;p- im8x rz3xtial diffe g*u bszp/+d8arence of, say, 0.10 V. How much greater would its final speed be if it is accelerated with four times as much voltage? Exzuag/ b*s+pd8plain.
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:
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