{"id":209352,"date":"2024-03-21T14:07:31","date_gmt":"2024-03-21T14:07:31","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%83%81%e3%82%a7%e3%83%ac%e3%83%b3%e3%82%b3%e3%83%95%e8%a7%92%e3%81%ae%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:11:07","modified_gmt":"2024-05-17T15:11:07","slug":"%e3%83%81%e3%82%a7%e3%83%ac%e3%83%b3%e3%82%b3%e3%83%95%e8%a7%92%e3%81%ae%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e3%83%81%e3%82%a7%e3%83%ac%e3%83%b3%e3%82%b3%e3%83%95%e8%a7%92%e3%81%ae%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u5a92\u8cea\u4e2d\u3067\u5149\u901f\u3092\u8d85\u3048\u308b\u7c92\u5b50\u304c\u653e\u5c04\u3059\u308b\u5149\u306e\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<h2>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u4f7f\u7528\u65b9\u6cd5<\/h2>\n<p>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\uff08\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u3053\u3046\u3001Cherenkov Angle\uff09\u306f\u3001\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u7c92\u5b50\u304c\u5a92\u8cea\u4e2d\u3067\u5149\u901f\u3092\u8d85\u3048\u305f\u3068\u304d\u306b\u751f\u3058\u308b\u73fe\u8c61\u3067\u3059\u3002\u4ee5\u4e0b\u3067\u306f\u3001\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f\u3001\u305d\u306e\u6982\u8981\u3001\u5b9f\u969b\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u3068\u306f\uff1f<\/h2>\n<p>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u306f\u3001\u7c92\u5b50\u304c\u5149\u3088\u308a\u901f\u3044\u901f\u5ea6\u3067\u5a92\u8cea\u4e2d\u3092\u79fb\u52d5\u3059\u308b\u3068\u304d\u306b\u767a\u751f\u3059\u308b\u5149\u306e\u653e\u51fa\u3067\u3059\u3002\u771f\u7a7a\u4e2d\u3067\u306f\u4f55\u3082\u5149\u901f\u3092\u8d85\u3048\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u5a92\u8cea\u4e2d\u3067\u306f\u5149\u306e\u901f\u5ea6\u304c\u9045\u304f\u306a\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6c34\u3084\u30ac\u30e9\u30b9\u306a\u3069\u306e\u4e2d\u3067\u306f\u5149\u306e\u901f\u5ea6\u304c\u9045\u3044\u305f\u3081\u3001\u9ad8\u901f\u3067\u79fb\u52d5\u3059\u308b\u8377\u96fb\u7c92\u5b50\u304c\u5149\u901f\u3092\u8d85\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u304c\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u306e\u539f\u56e0\u3067\u3059\u3002<\/p>\n<h2>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f<\/h2>\n<p>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2 $\\theta_C$ \u306f\u3001\u7c92\u5b50\u306e\u901f\u5ea6 $v$ \u3068\u5a92\u8cea\u4e2d\u306e\u5149\u901f $c\/n$ \u306e\u95a2\u4fc2\u304b\u3089\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\\[ \\cos \\theta_C = \\frac{c}{nv} \\]<\/p>\n<p>\u3053\u3053\u3067\u3001<\/p>\n<ul>\n<li>$c$ \u306f\u771f\u7a7a\u4e2d\u306e\u5149\u901f\uff08\u7d04299,792,458 m\/s\uff09\u3001<\/li>\n<li>$n$ \u306f\u5a92\u8cea\u306e\u5c48\u6298\u7387\u3001<\/li>\n<li>$v$ \u306f\u7c92\u5b50\u306e\u901f\u5ea6\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u65b9\u7a0b\u5f0f\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u306e\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u6c42\u3081\u65b9<\/h2>\n<p>\u4f8b\u3092\u6319\u3052\u3066\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u6c42\u3081\u65b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ol>\n<li>\u307e\u305a\u3001\u5a92\u8cea\u306e\u5c48\u6298\u7387 $n$ \u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6c34\u306e\u5c48\u6298\u7387 $n$ \u306f\u7d041.33\u3067\u3059\u3002<\/li>\n<li>\u6b21\u306b\u3001\u7c92\u5b50\u306e\u901f\u5ea6 $v$ \u3092\u77e5\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u96fb\u5b50\u304c\u6c34\u4e2d\u3092\u79d2\u901f2.5 \u00d7 10^8\u30e1\u30fc\u30c8\u30eb\uff082.5 \u00d7 10<sup>8<\/sup> m\/s\uff09\u3067\u79fb\u52d5\u3057\u3066\u3044\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li>\u65b9\u7a0b\u5f0f\u306b\u5024\u3092\u4ee3\u5165\u3057\u307e\u3059\uff1a<\/li>\n<\/ol>\n<p>\\[ \\theta_C = \\cos^{-1}\\left(\\frac{c}{nv}\\right) \\]<\/p>\n<p>\\[ \\theta_C = \\cos^{-1}\\left(\\frac{299,792,458}{1.33 \\times 2.5 \\times 10^8}\\right) \\]<\/p>\n<p>\u8a08\u7b97\u3059\u308b\u3068\u3001<\/p>\n<p>\\[ \\theta_C \u2248 \\cos^{-1}(0.899) \\]<\/p>\n<p>\\[ \\theta_C \u2248 25.84\u00b0 \\]<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u4f7f\u7528\u65b9\u6cd5<\/h2>\n<p>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306f\u9ad8\u30a8\u30cd\u30eb\u30ae\u30fc\u7269\u7406\u5b66\u3084\u6838\u7269\u7406\u5b66\u306e\u5b9f\u9a13\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30cb\u30e5\u30fc\u30c8\u30ea\u30ce\u691c\u51fa\u5668\u3084\u7c92\u5b50\u52a0\u901f\u5668\u306e\u5b9f\u9a13\u88c5\u7f6e\u3067\u3001\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u3092\u7528\u3044\u3066\u7c92\u5b50\u306e\u901f\u5ea6\u3092\u6e2c\u5b9a\u3057\u3001\u7c92\u5b50\u306e\u7a2e\u985e\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u306f\u5b87\u5b99\u7269\u7406\u5b66\u306b\u304a\u3051\u308b\u9ad8\u30a8\u30cd\u30eb\u30ae\u30fc\u73fe\u8c61\u306e\u89b3\u6e2c\u306b\u3082\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u5b87\u5b99\u7dda\u304c\u5730\u7403\u306e\u5927\u6c17\u306b\u885d\u7a81\u3057\u305f\u969b\u306b\u767a\u751f\u3059\u308b\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u5149\u3092\u89b3\u6e2c\u3059\u308b\u3053\u3068\u3067\u3001\u5b87\u5b99\u7dda\u306e\u60c5\u5831\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u5a92\u8cea\u4e2d\u3067\u5149\u901f\u3092\u8d85\u3048\u308b\u7c92\u5b50\u304c\u653e\u5c04\u3059\u308b\u5149\u306e\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u653e\u5c04\u306e\u73fe\u8c61\u81ea\u4f53\u306f\u3001\u9ad8\u30a8\u30cd\u30eb\u30ae\u30fc\u7269\u7406\u5b66\u3084\u5b87\u5b99\u7269\u7406\u5b66\u306e\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u6e90\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u8208\u5473\u3092\u6301\u3063\u305f\u65b9\u306f\u3001\u3055\u3089\u306b\u6df1\u304f\u3053\u306e\u73fe\u8c61\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30c1\u30a7\u30ec\u30f3\u30b3\u30d5\u89d2\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u5a92\u8cea\u4e2d\u3067\u5149\u901f\u3092\u8d85\u3048\u308b\u7c92\u5b50\u304c\u653e\u5c04\u3059\u308b\u5149\u306e\u89d2\u5ea6\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209352","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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