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Nov. 29th, 2004 03:49 am![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
meanfreepathIs this going to be a suicidal schedule?
Mon PM: Movement and Cognition
Tue PM: Physics 114 (Stat mech seminar)
Wed PM: Math 102 (Algebra seminar)
Thu PM: Physics 113 (Quantum seminar)
Some upperclassmen are telling me that having 3 seminars like that, especially back-to-back, will be murderous. I suppose I could not do the ling and just have 3 seminars, in which case I could at least move stat mech and algebra to Monday and Tuesday, respectively, and have a 1 day breather before quantum. Suggestions are welcome.
On an unrelated note, I spent some time writing to emeritus physics prof Mark Heald about an erratum in his textbook Classical Electromagnetic Radiation. I was using the book's section on radiation from half-wave antennas for my seminar presentation and I found a typo in this dreadful integral I had no choice but to put in to Mathematica.
Dear Professor Heald,
I am a current Swarthmore student who has had the pleasure of using your "Classical Electromagnetic Radiation" while preparing a presentation on
half-wave antennas for my electrodynamics seminar. I would like to point out a possible error I found in the derivation of the radiated B field of
a linear antenna in Ch. 9, that was not noted on the errata page on your website.
I believe there is a mistake in Equation 9.64 at the bottom of p. 306 in my copy of the 3rd edition. Prior to this, it was found that Brad
included an integral over x3 with an exponential term exp(ik(r-r')). Since doing a binomial expansion on r-r' gave us r-r' = r - x3 cos(theta),
I believe the exponential term in the integrand of Eqn. 9.64 should be exp(-i k x3 cos(theta)), and not exp(i x3 cos(theta)) as it currently
reads. Using Mathematica to do the integral with the integrand I believe is correct yielded the result in Eqn. 9.65.
Thank you for your attention to this matter. While what I found should certainly be verified by someone else, I feel that this possible error
could be particularly confusing since one of the end-of-chapter problems is to work out that very integral. Let me state in closing that I am
finding your book to be an excellent supplement for my seminar.
Sincerely,
Jerome Fung '06
Swarthmore College
Mon PM: Movement and Cognition
Tue PM: Physics 114 (Stat mech seminar)
Wed PM: Math 102 (Algebra seminar)
Thu PM: Physics 113 (Quantum seminar)
Some upperclassmen are telling me that having 3 seminars like that, especially back-to-back, will be murderous. I suppose I could not do the ling and just have 3 seminars, in which case I could at least move stat mech and algebra to Monday and Tuesday, respectively, and have a 1 day breather before quantum. Suggestions are welcome.
On an unrelated note, I spent some time writing to emeritus physics prof Mark Heald about an erratum in his textbook Classical Electromagnetic Radiation. I was using the book's section on radiation from half-wave antennas for my seminar presentation and I found a typo in this dreadful integral I had no choice but to put in to Mathematica.
Dear Professor Heald,
I am a current Swarthmore student who has had the pleasure of using your "Classical Electromagnetic Radiation" while preparing a presentation on
half-wave antennas for my electrodynamics seminar. I would like to point out a possible error I found in the derivation of the radiated B field of
a linear antenna in Ch. 9, that was not noted on the errata page on your website.
I believe there is a mistake in Equation 9.64 at the bottom of p. 306 in my copy of the 3rd edition. Prior to this, it was found that Brad
included an integral over x3 with an exponential term exp(ik(r-r')). Since doing a binomial expansion on r-r' gave us r-r' = r - x3 cos(theta),
I believe the exponential term in the integrand of Eqn. 9.64 should be exp(-i k x3 cos(theta)), and not exp(i x3 cos(theta)) as it currently
reads. Using Mathematica to do the integral with the integrand I believe is correct yielded the result in Eqn. 9.65.
Thank you for your attention to this matter. While what I found should certainly be verified by someone else, I feel that this possible error
could be particularly confusing since one of the end-of-chapter problems is to work out that very integral. Let me state in closing that I am
finding your book to be an excellent supplement for my seminar.
Sincerely,
Jerome Fung '06
Swarthmore College
