Recent content by help I have 12 hours

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    The relativistic Doppler effect

    Yes, I have done this. I found the f(obs) = (5.1189*10^14)hz and then I "un-shifted" to find the f(source)=(3.19675*10^15)hz which gave me lambda=94nm for the source light, but when I use the Rydberg equation from there I get a nonsense answer. Sorry, but can someone check if the problem has an...
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    The relativistic Doppler effect

    I found the observed frequency from the energy. Then I used the receding Doppler shift formula to find, the source frequency but after that when i tried to use the Rydberg equation I got a value for the energy level less than one. and I'm pretty sure my work is right, any help is greatly...
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    A diffraction grating formed by parallel adjacent tracks on a CDROM

    (d)sin(40.6)=(475*10^-9)(1) d=730*10^-9 (m) prof says answer is 1460*10^-9 (m) tho
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    Destructive interference near two speakers

    where x is the distance from one speaker 343=(66)(5.197) wave length =5.197m x-(50-x)=(5.197)(m+0.5) I choose m=-10 2x-50=(5.197)(-9.5) x=0.314m? Prof says correct answer is 1.6m tho
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    Problem about compound optics in microscopes

    or get me very close to the answer, cus I'm not getting it and i don't have time to get it. thank you
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    Problem about compound optics in microscopes

    thank you I'm very busy and confused, can you tell me the answer?
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    Problem about compound optics in microscopes

    if the distance from the object to the objective lens is .2 cm. How does 1/s+1/s'=1/f? 1/.2+1/22.2=1/.2 ?
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    Problem about compound optics in microscopes

    How do I find the image distance of the objective if I don't know where the objective is? Thanks
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    Problem about compound optics in microscopes

    angular magnification=9.62 part a 1/s+1/s'=5 1/(25-s-s')+1/s"=1/2.6 -s"/s=m can't find m, don't know how to use the info that a person of normal eyesight is looking into the microscope.
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    Chrenkov radiation cone angle vs. the speed of the particle

    cos(theta)=c/vn cos(1.2 degrees)=((3*10^8)/v(1.03)) v=291262135.9 v/c=.971 so the particle is moving at (.971)c But mastering physics tells me this is wrong, and says that I'm not account for the angle. I am really stumped.
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