Concerning the far field from linearly moving wave source, the frequency spectrum and the instant frequency are analyzed respectively in the case of short and long radiating times by the special relativity and these are compared with the analytical results by the non-relativity. It is shown that the frequencies obtained by the special relativity are equal to these by the non-relativity multiplied by √<1-(v/c)^2>
直線運動する波源による遠方界の周波数スペクトルと瞬時周波数の特殊相対論による解析
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