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![[Post New]](/templates/default/images/icon_minipost_new.gif) 20 Jul 2008 22:37:11 IST
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when light travel from one medium to the other say from water to light does their amy change in its kinetic energy ??????
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20 Jul 2008 22:39:17 IST
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If U consider light's particle nature, then YES.
Obviously the KE of photon wud change becoz the velocity of light is different in different mediums.
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20 Jul 2008 22:45:37 IST
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dear tarinbansal will u plz give me the fact that from this energy come ???????is it contadiction to law of conservation of energy
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20 Jul 2008 23:00:06 IST
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Sorry, I am not able to get ur doubt.
Contradiction to law of conservation of energy kahan se aa gaya?
When we talk abt particle nature of light, we say that light is made up of particles known as photons. Now particles can have K.E. When it enters in a medium, the interaction of these photons with the particles of medium changes.
For ex-in a denser medium, the photons experience more force opposing their movement. It maybe due to increased friction or more collisions of photons with more closely packed particles of dense medium. And due to this force, the K.E. of photons wud decrease in a denser medium.
Hope its clear now.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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Can marks really judge a student??
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20 Jul 2008 23:06:29 IST
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dear tarin bansal i think light is treated as wave in refraction ithink it is one of the exceptons if light is a wave then its energy is given by e=h(muo) which is same in denser as well as rarer medium is it true????
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20 Jul 2008 23:13:45 IST
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Indeed.
The world is divided into 2 classes-----light and non-light.
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it is not important where u stand, but in which direction u are moving |
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20 Jul 2008 23:16:05 IST
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hey ramayni i cant able to understand u
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20 Jul 2008 23:16:24 IST
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But how can U talk abt KE if U R considering the wave nature of light. I am a bit confused abt this.
But I am sure abt one thing that both the nature's of light viz., particle and wave are valid and we can define the KE thing here using the particle nature of light.
And E=h.nu is the TOTAL energy of light and not KE. Maybe it happens that total energy remains same but KE changes. I am not so sure with this thing considering the wave nature of light.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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20 Jul 2008 23:19:51 IST
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dear mine aise hi qes puch liya ajj sir ne karvaya tha clear nahin hua mane reading ki hai is topic par ab sir se dubara puchunga ab aap batao yeh qes sahi hai ki nahin aur mere thinking kaise hai thik hai ki galat
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20 Jul 2008 23:25:02 IST
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OK fine. :)
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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21 Jul 2008 20:32:05 IST
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velocity of light is higher in rarer medium because the number of collisions with the medium molecules is less!
In denser medium it collides with more number of molecules ! therefore some energy is lost ! velocity decreases!
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21 Jul 2008 20:40:20 IST
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@GopalKrishna
KE of light is zero because mass of a photon is zero. Otherwise, how can you explain the increase in energy when light travels from denser to rarer???
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xxxxxxxxxxxxxxx Dylan João Colaço .xxxxxxxxxxxxxx |
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22 Jul 2008 18:57:40 IST
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@djdylan2000,
Rest mass of a photon is zero. But that's a different concept. We shud not use it there.
If U say that its KE is zero, it also means that it cant exert any force but that's not true. Light exerts pressure also. So in this case, we can assume photon to be a normal particle.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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23 Jul 2008 08:59:44 IST
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The K.E of light in any medium is always infinity (Acc.to Einstein)
In relativistic Energy equation-E=Eo/sq rt 1-v^2/c^2
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