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![[Post New]](/templates/default/images/icon_minipost_new.gif) 10 May 2008 16:11:54 IST
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From Compton effect we have the formula :
dl = h (1 - cos @ )/ mec...
where dl is change in wavelength,
h is Plancks constant,
@ is angle of scattering of photon,
c is veolcity of light..
My doubt is this sentence :
"Thus, scattered wavelength is always greater than the incident wavelength.This provides convincing evidence of quantum nature of radiation ."
How???
Rates assured!
Thanks!
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10 May 2008 16:12:46 IST
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gud question
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SAIYANS ARE OF TRUE WARRIOR RACE . DONT UNDER-ESTIMATE US!
special theory of relativity ....i luv it...
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10 May 2008 16:21:05 IST
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do u mean how it proves photon concept of electron
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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10 May 2008 16:24:21 IST
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hey
the compton theory used the quantam concept and particle nature of photon laws of conservation of energy and momentum applied to point like scattering of photon from electron was the proof i can give details if u want
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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10 May 2008 16:24:46 IST
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am i correct
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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10 May 2008 16:26:04 IST
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I meant how does it prove quantum nature of radiation, as opposed to the classical picture?
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10 May 2008 16:27:39 IST
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do u want the proof i can give
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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10 May 2008 16:29:58 IST
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higher wavelenght means lower energy.
imagine electrons in n = 1 state. (maximum amount of electrons here). it will absorb a photon only of certal energy, so that it can go EXACTLY to any integral higher state. suppose it goes to n = 3.
from here, it comes back to n = 1. but not directly. some amount of electrons will go directly, some go to n = 2 and then to n =1 .
the few electrons who go from n = 3 to n = 2 will cause a high wavelneght photon to be emitted.
the electrons who were not in n= 1 to begin with are a very very small amount, so their contribution is negligible.
you mey not consider my explanation as good enough.. but this is true.. i had asked my sir some time ago.
cheers
shreyas
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10 May 2008 16:30:31 IST
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I want to know how the fact that scattered wavelength is greater than incident wavelength proves quantum nature of radiation.
@cutepooja - if the proof explains THIS,please give it !
Thanks!!
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10 May 2008 16:31:59 IST
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classical theory says when a photon interacts wid electron the electrons oscillate wid freq of photon as the interaction radiates em radiation at this freq (thomson scatterin)
at backward scattering angles there appeared a component of emiited rad (modifeid wave) had a longer wavelength than unmodified
the classical theory cud not explain that
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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10 May 2008 16:32:44 IST
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wait i am writin further but pls guide me am i goin correct
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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10 May 2008 16:32:45 IST
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o ya n the quantum theory.. well, the electron wud not go from n = 3 to n =2 to n =1 unless these quantum states existed in the first place... i agree the statement is slightly vague.. probably they are mentioning in context to something they wrote before this also?
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10 May 2008 16:34:53 IST
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Light must behave as if it consists of particles in order to explain the Compton scattering. Compton's experiment convinced physicists that light can behave as a stream of particles whose energy is proportional to the frequency.
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altitude begets altitude. |
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10 May 2008 16:37:03 IST
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@cutepooja- pl. go on..I think I'm understanding something
@shreyasnivas -before this the only thing is Compton effect itself-the description..could that be it?Thanks for your answer!!I partly understood!
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10 May 2008 16:38:08 IST
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