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01-12-2009, 10:53 PM
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Aplane electromagnetic wave travels through auniform plasma> show that the Poynting vector vanishes if the frequency of the waves is less than the plasma frequency.
Consider aplasma consisting of helium gas at pressure of 10^-3mmHg in which essentially every atom is singly ionized. To what depth will a10 Kc/s electromagnetic wave penetrate this plasma before it is reduced in intensity to 10%of its original value?
Aplane electromagnetic wave travels through auniform plasma> show that the Poynting vector vanishes if the frequency of the waves is less than the plasma frequency.
Consider aplasma consisting of helium gas at pressure of 10^-3mmHg in which essentially every atom is singly ionized. To what depth will a10 Kc/s electromagnetic wave penetrate this plasma before it is reduced in intensity to 10%of its original value?