Doubt as to application of Wien's displacement law

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Do Wien's displacement law hold true even for bodies with emissivity not equal to 1, that is, non-black bodies?
 
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No.
Just imagine the body which emissivity is non-zero only in some narrow span (e.g. vapour of Sodium). Regardless of temperature its maximum of emission is always yellow.
 

Thread 'Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms'

Assume that this is a case where by sheer coincidence, two sources of coherent single-frequency EM wave pulses with equal duration are both fired in opposing directions, with both carrying the same frequency and amplitude and orientation. These two waves meet head-on while moving in opposing directions, and their phases are precisely offset by 180 degrees so that each trough of one wave meets with the crest of the other. This should be true for both the electric and magnetic components of...
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