电动力学期末试卷

电动力学期末试卷

浙江大学2009–2010学年秋冬学期

《电动力学》课程期末考试试卷课程号:_06120310，开课学院:_物理系

考试试卷:A卷、B卷考试形式:闭、开卷，允许带_1张A4纸入场

考试日期: 2010 年 1 月 19 日, 考试时间: 120 分钟

诚信考试，沉着应考，杜绝违纪。

考生姓名: 学号: 所属院系: _

题序一二三四五六总分

得分

评卷人

一、简答题 :5 (每小题分)

1) Explain the transverse Doppler shift and the starlight aberration.

2) What is anomalous dispersion?

3) Derive Snell’s law.

4) Compare Bremsstrahlung and Synchrotron radiation?

5) What is TEM waves? Can they exist in a rectangular wave guide?

(以下每题15分)

二、Two infinitely long grounded metal plates, at yandya,,0,

,are connected at by metal strips at a constant potential. xb,,0

(a thin layer of insulation prevents them from shorting out).

Find the potential inside the resulting rectangular pipe.

三、 A pion at rest decays into a muon and a massless neutrino. Find the energy

mmandof the outgoing muon in terms of the two masses . ,,

RR()四、A spherical shell of inner (outer) radius , made of 12

material of the permeability, is placed in a uniform magnetic , induction. Find the magnetic induction everywhere. B0

五、In Bohr’s hydrogen the electron was supposed to travel in a circle around the

proton. In electrodynamics, this electron should radiate and spiral in to the

nucleus. Calculate the lifetime of Bohr’s atom. (Assume .) vc

六、An electromagnetic wave propagates in a plasma, where the conductivity is

. Calculate the cutoff frequency, phase and group velocities.

2 ne0,,().,im,