Recent content by samreen

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    EM Theory: Refractive index of water

    Homework Statement Problem: Sea water has k = 80 in the low frequency limit. Yet its refractive index is around 1.34. Explain the discrepancy Homework Equations For a non magnetic dielectric medium, the absolute refractive index in the low frequency range, is given by : n = √k...
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    Thermal Radiation & 'Black Radiation': Explained

    it all seems so nice and obvious the way u put it. that was a ton of help :) thanx!
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    Thermal Radiation & 'Black Radiation': Explained

    nope. i mean black radiation. I am talking general here. we know from kirchhoffs work that any enclosure that is opaque to all kinds of radiation, will when maintained at any constant temperature, behave like an ideal black body, and emit radiation characteristic of that temperature, right...
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    Thermal Radiation & 'Black Radiation': Explained

    what is 'black radiation' ? or specifically, the meaning of the phrase "radiation in equilibrium with matter"...in the context of thermal radiation. clueless here :'(
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    Equality of fouriers expression

    i looked up the bit about the overshoot (gibbs penomenon)..thanks, was interesting. and I'm absolutely sure about the answer to my question now. thanks again, everyone! the equality does NOT hold rigorously, if you want to be a purist about it. in fact, i went back and looked up quite a few...
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    Van der waals & Andrews curve: discrepancy

    Homework Statement the Pressure (P) versus Volume (V) isotherms of a real gas theoretically obtained form van der waals equation of state approximately overlap with the experimentally obtained isotherms of Andrews for carbon dioxide gas. However, for those isotherms below the critical...
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    Equality of fouriers expression

    exactly. that's what i mean by 'assuming mean value at every point'. so the series IS defined at discontinuous points of the function, or points of no definition. so i return to my question: how does the equality hold?
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    Equality of fouriers expression

    When we are resolving a periodic piecewise continuous function in a fouriers series of harmonic terms, as follows: f(x)= a0/2 +Σancos nΠx/L + Σ bnsin nΠx/L, period 2L we are essentially expressing a sectionally discontinuous function (with finite no of such finite discontinuities, if at...
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    Understanding Wave Dispersion & Group Velocity: Help Needed!

    i think I've got it somewhat. a dispersive medium is one that can sense the discreteness of a complex wave. because frequency is an issue for it. whereas a non dispersive medium is too stupid to. for it, there effectively is just that fancy wave propagating thru it. and it isn't much bothered by...
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    Understanding Wave Dispersion & Group Velocity: Help Needed!

    *for a group of waves, the energy is transmitted with the group velocity. what does that mean? *what is meant, as in actually meant, by dispersion of a wave in a medium? whatever i looked up says phase velocity depends on frequency for a dispersive medium and vice versa. Why? * wave...
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    Classical Oscillator Resonance: Understanding & Amplification

    thanx guys...makes a load of sense now
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    Maxwellian velocity distribution

    the gas will condense, itl no longer be a gas. so maxwells distribution ought not to apply. I've got it partly.
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    Classical Oscillator Resonance: Understanding & Amplification

    ive dun the math...for free, damped and forced. trouble is, it feels like math.not physics. which is what I've asked.
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    Classical Oscillator Resonance: Understanding & Amplification

    for a classical oscillator. i kno when resonance happens. what i don't know is WHAT happens in resonance. and WHY it happens. I am very sketchy bt the details...is resonance happening when the system is oriented or configured to b able to absorb max energy? why the amplification? could u...
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    Maxwellian velocity distribution

    why does maxwells breakdown or whatever, for low T?
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