Recent content by ada_ada_2002

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    Graduate Equation of temperature increase by shock wave

    Your answer is quite clear! Thank you SO MUCH, Meldraft!
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    Graduate Equation of temperature increase by shock wave

    Not intended to do this subject a lot, just curious. Anyway, cannot find relations between initial piston speed, and the consequent shock speed. Just know that shock propagate ahead of the piston. By how much exactly?
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    Graduate Equation of temperature increase by shock wave

    Thank you meldraft! So, how to calculate the speed of a shock? is there any equations? I just what to know what exactly influence the shock speed. BTW, I have found the temperature equation
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    Graduate Equation of temperature increase by shock wave

    Another question: If the shock wave is triggered by a piston, why it can propagate at a speed larger than that of the piston? what determine the speed of a shock?
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    Graduate Equation of temperature increase by shock wave

    【HELP】Equation of temperature increase by shock wave Hi there! What is the equation of the temperature increase when the ideal gas swept by a planar shock wave (Mach number, M)? Thank you!
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    Undergrad Questions about light absorption

    why most material absorb EUV-region light? why hard X-ray can go through all material? 【http://galileo.phys.virginia.edu/classes/252/black_body_radiation.html】← here doesn't explain that. Thank you!
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    Graduate Optimizing the Radius of a Synchrotron for Radiation Production

    Thank you Andrew! I can get what you and ZapperZ said. Maybe most synchrotrons are not built for radiation, that's why they made the storage ring so large. If for radiation, bending the relativistic electrons at a small radius is not impossible: at least, they have already developed free...
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    Graduate Optimizing the Radius of a Synchrotron for Radiation Production

    Thank you ZapperZ!
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    Graduate Optimizing the Radius of a Synchrotron for Radiation Production

    well, I mean, how the researched decided the radius of the storage ring in the first place. If I want to use the radiation, I will think about the wavelength range and the radiation intensity. Are there anything else I should consider? And how to choose a radius based on these considerations...
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    Graduate Optimizing the Radius of a Synchrotron for Radiation Production

    Hi, there. I have a question： If I want to build a facility for synchrotron RADIATION (not for particle physics experiment), how to chose the radius of the storage ring? (Why the radii of current facilities are so large?) Thank you.
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    Undergrad What is the isolated spectral line?

    thanks！
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    Undergrad What is the isolated spectral line?

    Thank you Zhermes. So is it correct that when the line broadening is not significant, or when the 504.2 line doesn't appear, the 501.6 line is still an "isolated line"?
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    Undergrad What is the isolated spectral line?

    【help】what is the isolated spectral line? Hi, there. Could anyone please tell me the definition of the "isolated spectral line"? A paper (http://pra.aps.org/abstract/PRA/v44/i10/p6785_1) said: He I 501.6 nm line is not an isolated one, it has a forbidden component (504.2 nm)... Thank you
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    Graduate [help] about electron-ion collision

    Thank you, Drakkith. I will think about it. I can imagine the picture, I am just not clear about the energy flow/transport in this process.
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    Graduate [help] about electron-ion collision

    Thank you! One thing I don't understand is: in this condition, the energy of ion is much much higher than that of electron, how can ion gain more energy? (ionization means ion's energy increases, right?)