{"id":19425,"date":"2025-07-22T07:15:43","date_gmt":"2025-07-22T00:15:43","guid":{"rendered":"https:\/\/trungvu.net\/?p=19425"},"modified":"2025-07-22T07:15:48","modified_gmt":"2025-07-22T00:15:48","slug":"cac-loai-song-trong-vat-ly-phan-loai-dac-diem-va-bi-an-tu-song-hap-dan","status":"publish","type":"post","link":"https:\/\/trungvu.net\/wordpress\/cac-loai-song-trong-vat-ly-phan-loai-dac-diem-va-bi-an-tu-song-hap-dan\/","title":{"rendered":"C\u00e1c lo\u1ea1i s\u00f3ng trong v\u1eadt l\u00fd: Ph\u00e2n lo\u1ea1i, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 b\u00ed \u1ea9n t\u1eeb s\u00f3ng h\u1ea5p d\u1eabn"},"content":{"rendered":"\n

S\u00f3ng l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng ph\u1ed5 bi\u1ebfn trong t\u1ef1 nhi\u00ean v\u00e0 c\u00f3 m\u1eb7t \u1edf m\u1ecdi quy m\u00f4 \u2013 t\u1eeb nh\u1eefng g\u1ee3n s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc \u0111\u1ebfn nh\u1eefng dao \u0111\u1ed9ng kh\u1ed5ng l\u1ed3 trong k\u1ebft c\u1ea5u kh\u00f4ng-th\u1eddi gian. Trong v\u1eadt l\u00fd, s\u00f3ng kh\u00f4ng ch\u1ec9 mang theo n\u0103ng l\u01b0\u1ee3ng m\u00e0 c\u00f2n l\u00e0 c\u1ea7u n\u1ed1i gi\u1eefa l\u00fd thuy\u1ebft v\u00e0 \u1ee9ng d\u1ee5ng, gi\u1eefa th\u1ebf gi\u1edbi vi m\u00f4 v\u00e0 v\u0169 tr\u1ee5 bao la. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u c\u00e1c lo\u1ea1i s\u00f3ng trong v\u1eadt l\u00fd, c\u00e1ch ph\u00e2n lo\u1ea1i, \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf, \u0111\u1eb7c bi\u1ec7t l\u00e0 kh\u00e1m ph\u00e1 s\u00f3ng h\u1ea5p d\u1eabn \u2013 d\u1ea1ng s\u00f3ng k\u1ef3 b\u00ed g\u1eafn li\u1ec1n v\u1edbi thuy\u1ebft t\u01b0\u01a1ng \u0111\u1ed1i r\u1ed9ng c\u1ee7a Einstein.<\/p>\n\n\n\n

\"C\u00e1c
C\u00e1c lo\u1ea1i s\u00f3ng trong v\u1eadt l\u00fd: Ph\u00e2n lo\u1ea1i, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 b\u00ed \u1ea9n t\u1eeb s\u00f3ng h\u1ea5p d\u1eabn<\/em><\/figcaption><\/figure>\n\n\n\n

1. S\u00f3ng l\u00e0 g\u00ec?<\/strong><\/p>\n\n\n\n

S\u00f3ng l\u00e0 qu\u00e1 tr\u00ecnh lan truy\u1ec1n dao \u0111\u1ed9ng trong kh\u00f4ng gian v\u00e0 th\u1eddi gian. S\u00f3ng c\u00f3 th\u1ec3 truy\u1ec1n n\u0103ng l\u01b0\u1ee3ng t\u1eeb \u0111i\u1ec3m n\u00e0y \u0111\u1ebfn \u0111i\u1ec3m kh\u00e1c m\u00e0 kh\u00f4ng mang theo v\u1eadt ch\u1ea5t (tr\u1eeb m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t nh\u01b0 s\u00f3ng c\u01a1 h\u1ecdc).<\/p>\n\n\n\n

\ud83d\udd01 C\u00e1c y\u1ebfu t\u1ed1 c\u01a1 b\u1ea3n c\u1ee7a s\u00f3ng:<\/strong><\/p>\n\n\n\n

Th\u00f4ng s\u1ed1<\/strong><\/td>K\u00fd hi\u1ec7u<\/strong><\/td>\u0110\u01a1n v\u1ecb<\/strong><\/td>Gi\u1ea3i th\u00edch<\/strong><\/td><\/tr>
B\u01b0\u1edbc s\u00f3ng<\/td>\u03bb<\/td>m\u00e9t (m)<\/td>Kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u1ec9nh s\u00f3ng li\u00ean ti\u1ebfp<\/td><\/tr>
T\u1ea7n s\u1ed1<\/td>f<\/td>Hertz (Hz)<\/td>S\u1ed1 dao \u0111\u1ed9ng trong m\u1ed9t gi\u00e2y<\/td><\/tr>
Chu k\u1ef3<\/td>T<\/td>gi\u00e2y (s)<\/td>Th\u1eddi gian \u0111\u1ec3 ho\u00e0n th\u00e0nh m\u1ed9t dao \u0111\u1ed9ng<\/td><\/tr>
Bi\u00ean \u0111\u1ed9<\/td>A<\/td>m\u00e9t (m)<\/td>\u0110\u1ed9 l\u1edbn dao \u0111\u1ed9ng \u2013 quy\u1ebft \u0111\u1ecbnh n\u0103ng l\u01b0\u1ee3ng<\/td><\/tr>
V\u1eadn t\u1ed1c s\u00f3ng<\/td>v<\/td>m\/s<\/td>T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng: v = \u03bb \u00d7 f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

2. Ph\u00e2n lo\u1ea1i s\u00f3ng trong v\u1eadt l\u00fd<\/strong><\/p>\n\n\n\n

T\u00f9y theo m\u00f4i tr\u01b0\u1eddng truy\u1ec1n, ph\u01b0\u01a1ng dao \u0111\u1ed9ng v\u00e0 b\u1ea3n ch\u1ea5t v\u1eadt l\u00fd, s\u00f3ng \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u lo\u1ea1i:<\/p>\n\n\n\n

2.1. Theo m\u00f4i tr\u01b0\u1eddng truy\u1ec1n s\u00f3ng<\/strong><\/p>\n\n\n\n

a. S\u00f3ng c\u01a1 h\u1ecdc (Mechanical Waves)<\/strong><\/p>\n\n\n\n

    \n
  • C\u1ea7n m\u00f4i tr\u01b0\u1eddng v\u1eadt ch\u1ea5t \u0111\u1ec3 truy\u1ec1n (r\u1eafn, l\u1ecfng, kh\u00ed).<\/li>\n\n\n\n
  • V\u00ed d\u1ee5: s\u00f3ng \u00e2m, s\u00f3ng n\u01b0\u1edbc, s\u00f3ng \u0111\u1ecba ch\u1ea5n.<\/li>\n\n\n\n
  • \u1ee8ng d\u1ee5ng: \u00e2m nh\u1ea1c, si\u00eau \u00e2m, nghi\u00ean c\u1ee9u \u0111\u1ed9ng \u0111\u1ea5t.<\/li>\n<\/ul>\n\n\n\n

    b. S\u00f3ng \u0111i\u1ec7n t\u1eeb (Electromagnetic Waves)<\/strong><\/p>\n\n\n\n

      \n
    • Kh\u00f4ng c\u1ea7n m\u00f4i tr\u01b0\u1eddng v\u1eadt ch\u1ea5t \u2013 truy\u1ec1n \u0111\u01b0\u1ee3c trong ch\u00e2n kh\u00f4ng.<\/li>\n\n\n\n
    • V\u00ed d\u1ee5: \u00e1nh s\u00e1ng, s\u00f3ng radio, tia X, tia gamma.<\/li>\n\n\n\n
    • \u1ee8ng d\u1ee5ng: truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y, radar, ch\u1ee5p X-quang.<\/li>\n<\/ul>\n\n\n\n

      c. S\u00f3ng h\u1ea5p d\u1eabn (Gravitational Waves) \u2014 <\/strong><\/p>\n\n\n\n

      [Xem chi ti\u1ebft \u1edf m\u1ee5c 4]<\/strong><\/p>\n\n\n\n

        \n
      • L\u00e0 g\u1ee3n s\u00f3ng trong kh\u00f4ng-th\u1eddi gian, kh\u00f4ng c\u1ea7n m\u00f4i tr\u01b0\u1eddng.<\/li>\n\n\n\n
      • Do c\u00e1c s\u1ef1 ki\u1ec7n v\u0169 tr\u1ee5 l\u1edbn nh\u01b0 h\u1ed1 \u0111en va ch\u1ea1m t\u1ea1o ra.<\/li>\n<\/ul>\n\n\n\n

        2.2. Theo ph\u01b0\u01a1ng dao \u0111\u1ed9ng<\/strong><\/p>\n\n\n\n

        a. S\u00f3ng d\u1ecdc (Longitudinal Waves)<\/strong><\/p>\n\n\n\n

          \n
        • Dao \u0111\u1ed9ng c\u00f9ng ph\u01b0\u01a1ng v\u1edbi truy\u1ec1n s\u00f3ng.<\/li>\n\n\n\n
        • V\u00ed d\u1ee5: s\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed.<\/li>\n<\/ul>\n\n\n\n

          b. S\u00f3ng ngang (Transverse Waves)<\/strong><\/p>\n\n\n\n

            \n
          • Dao \u0111\u1ed9ng vu\u00f4ng g\u00f3c v\u1edbi h\u01b0\u1edbng truy\u1ec1n s\u00f3ng.<\/li>\n\n\n\n
          • V\u00ed d\u1ee5: s\u00f3ng \u00e1nh s\u00e1ng, s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc.<\/li>\n<\/ul>\n\n\n\n

            2.3. Theo b\u1ea3n ch\u1ea5t v\u1eadt l\u00fd<\/strong><\/p>\n\n\n\n

            Lo\u1ea1i s\u00f3ng<\/strong><\/td>B\u1ea3n ch\u1ea5t<\/strong><\/td>V\u00ed d\u1ee5 \u2013 \u1ee8ng d\u1ee5ng<\/strong><\/td><\/tr>
            S\u00f3ng \u00e2m<\/td>S\u00f3ng c\u01a1 h\u1ecdc d\u1ecdc<\/td>Giao ti\u1ebfp, si\u00eau \u00e2m y h\u1ecdc<\/td><\/tr>
            S\u00f3ng \u00e1nh s\u00e1ng<\/td>S\u00f3ng \u0111i\u1ec7n t\u1eeb<\/td>Chi\u1ebfu s\u00e1ng, laser, truy\u1ec1n d\u1eef li\u1ec7u<\/td><\/tr>
            S\u00f3ng radio<\/td>S\u00f3ng \u0111i\u1ec7n t\u1eeb<\/td>Radio, truy\u1ec1n h\u00ecnh, \u0111i\u1ec7n tho\u1ea1i<\/td><\/tr>
            S\u00f3ng vi ba (microwave)<\/td>S\u00f3ng \u0111i\u1ec7n t\u1eeb<\/td>L\u00f2 vi s\u00f3ng, radar, GPS<\/td><\/tr>
            S\u00f3ng h\u1ea1 \u00e2m \u2013 si\u00eau \u00e2m<\/td>S\u00f3ng c\u01a1 t\u1ea7n s\u1ed1 \u0111\u1eb7c bi\u1ec7t<\/td>Ph\u00e1t hi\u1ec7n \u0111\u1ed9ng \u0111\u1ea5t, si\u00eau \u00e2m thai<\/td><\/tr>
            S\u00f3ng h\u1ea5p d\u1eabn<\/td>Dao \u0111\u1ed9ng kh\u00f4ng-th\u1eddi gian<\/td>Thi\u00ean v\u0103n h\u1ecdc, nghi\u00ean c\u1ee9u v\u0169 tr\u1ee5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

            3. So s\u00e1nh nhanh c\u00e1c lo\u1ea1i s\u00f3ng<\/strong><\/p>\n\n\n\n

            \u0110\u1eb7c \u0111i\u1ec3m<\/strong><\/td>S\u00f3ng c\u01a1 h\u1ecdc<\/strong><\/td>S\u00f3ng \u0111i\u1ec7n t\u1eeb<\/strong><\/td>S\u00f3ng h\u1ea5p d\u1eabn<\/strong><\/td><\/tr>
            C\u1ea7n m\u00f4i tr\u01b0\u1eddng?<\/td>C\u00f3<\/td>Kh\u00f4ng<\/td>Kh\u00f4ng<\/td><\/tr>
            B\u1ea3n ch\u1ea5t<\/td>Dao \u0111\u1ed9ng v\u1eadt ch\u1ea5t<\/td>Dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb<\/td>Dao \u0111\u1ed9ng kh\u00f4ng-th\u1eddi gian<\/td><\/tr>
            V\u00ed d\u1ee5<\/td>S\u00f3ng \u00e2m, s\u00f3ng n\u01b0\u1edbc<\/td>\u00c1nh s\u00e1ng, radio<\/td>H\u1ed1 \u0111en va ch\u1ea1m<\/td><\/tr>
            T\u1ed1c \u0111\u1ed9<\/td>Th\u1ea5p h\u01a1n \u00e1nh s\u00e1ng<\/td>= T\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng<\/td>= T\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng<\/td><\/tr>
            \u1ee8ng d\u1ee5ng<\/td>\u00c2m thanh, \u0111o \u0111\u1ea1c<\/td>Truy\u1ec1n th\u00f4ng<\/td>Nghi\u00ean c\u1ee9u v\u0169 tr\u1ee5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

            4. S\u00f3ng h\u1ea5p d\u1eabn \u2013 C\u00e1nh c\u1eeda m\u1edf ra v\u0169 tr\u1ee5 v\u00f4 h\u00ecnh<\/strong><\/p>\n\n\n\n

            4.1. S\u00f3ng h\u1ea5p d\u1eabn l\u00e0 g\u00ec?<\/strong><\/p>\n\n\n\n

            S\u00f3ng h\u1ea5p d\u1eabn (Gravitational Waves) l\u00e0 nh\u1eefng g\u1ee3n s\u00f3ng trong k\u1ebft c\u1ea5u kh\u00f4ng-th\u1eddi gian, xu\u1ea5t hi\u1ec7n khi c\u00e1c thi\u00ean th\u1ec3 c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng c\u1ef1c l\u1edbn (nh\u01b0 h\u1ed1 \u0111en, sao neutron) gia t\u1ed1c ho\u1eb7c va ch\u1ea1m m\u1ea1nh.<\/p>\n\n\n\n

            \u0110\u01b0\u1ee3c ti\u00ean \u0111o\u00e1n b\u1edfi Albert Einstein n\u0103m 1916, nh\u01b0ng ph\u1ea3i \u0111\u1ebfn 2015, nh\u00e2n lo\u1ea1i m\u1edbi ghi nh\u1eadn \u0111\u01b0\u1ee3c s\u00f3ng h\u1ea5p d\u1eabn th\u1ef1c nghi\u1ec7m t\u1ea1i LIGO (M\u1ef9).<\/p>\n\n\n\n

            4.2. S\u00f3ng h\u1ea5p d\u1eabn h\u00ecnh th\u00e0nh th\u1ebf n\u00e0o?<\/strong><\/p>\n\n\n\n

            C\u00e1c hi\u1ec7n t\u01b0\u1ee3ng t\u1ea1o ra s\u00f3ng h\u1ea5p d\u1eabn bao g\u1ed3m:<\/p>\n\n\n\n

              \n
            • Hai h\u1ed1 \u0111en h\u1ee3p nh\u1ea5t<\/li>\n\n\n\n
            • Sao neutron quay nhanh<\/li>\n\n\n\n
            • V\u1ee5 n\u1ed5 si\u00eau t\u00e2n tinh<\/li>\n\n\n\n
            • Giai \u0111o\u1ea1n gi\u00e3n n\u1edf m\u1ea1nh sau Big Bang<\/li>\n<\/ul>\n\n\n\n

              Khi nh\u1eefng v\u1eadt th\u1ec3 n\u00e0y t\u01b0\u01a1ng t\u00e1c m\u1ea1nh, ch\u00fang l\u00e0m bi\u1ebfn d\u1ea1ng kh\u00f4ng-th\u1eddi gian v\u00e0 ph\u00e1t ra s\u00f3ng h\u1ea5p d\u1eabn lan \u0111i kh\u1eafp v\u0169 tr\u1ee5.<\/p>\n\n\n\n

              4.3. \u0110\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a s\u00f3ng h\u1ea5p d\u1eabn<\/strong><\/p>\n\n\n\n

              T\u00ednh ch\u1ea5t<\/strong><\/td>M\u00f4 t\u1ea3<\/strong><\/td><\/tr>
              B\u1ea3n ch\u1ea5t<\/td>Dao \u0111\u1ed9ng c\u1ee7a kh\u00f4ng-th\u1eddi gian<\/td><\/tr>
              T\u1ed1c \u0111\u1ed9<\/td>B\u1eb1ng t\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng<\/td><\/tr>
              Kh\u00f4ng c\u1ea7n m\u00f4i tr\u01b0\u1eddng<\/td>C\u00f3 th\u1ec3 truy\u1ec1n qua ch\u00e2n kh\u00f4ng tuy\u1ec7t \u0111\u1ed1i<\/td><\/tr>
              Bi\u00ean \u0111\u1ed9 r\u1ea5t nh\u1ecf<\/td>Bi\u1ebfn d\u1ea1ng nh\u1ecf h\u01a1n c\u1ea3 proton \u2013 c\u1ea7n thi\u1ebft b\u1ecb si\u00eau nh\u1ea1y \u0111\u1ec3 ph\u00e1t hi\u1ec7n<\/td><\/tr>
              Kh\u00f3 ph\u00e1t hi\u1ec7n<\/td>Ph\u1ea3i d\u00f9ng c\u00e1c \u0111\u00e0i quan s\u00e1t \u0111\u1eb7c bi\u1ec7t nh\u01b0 LIGO, Virgo, KAGRA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

              4.4. T\u1ea7m quan tr\u1ecdng v\u00e0 \u1ee9ng d\u1ee5ng<\/strong><\/p>\n\n\n\n

              D\u00f9 kh\u00f4ng c\u00f3 \u1ee9ng d\u1ee5ng d\u00e2n d\u1ee5ng nh\u01b0 s\u00f3ng \u00e1nh s\u00e1ng hay \u00e2m thanh, s\u00f3ng h\u1ea5p d\u1eabn l\u00e0 m\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 nghi\u00ean c\u1ee9u v\u0169 tr\u1ee5 m\u1ea1nh nh\u1ea5t hi\u1ec7n nay, cho ph\u00e9p:<\/p>\n\n\n\n

                \n
              • \u201cNghe\u201d \u0111\u01b0\u1ee3c c\u00e1c s\u1ef1 ki\u1ec7n trong kh\u00f4ng gian xa x\u00f4i m\u00e0 \u00e1nh s\u00e1ng kh\u00f4ng th\u1ec3 ti\u1ebft l\u1ed9.<\/li>\n\n\n\n
              • M\u1edf ra ng\u00e0nh m\u1edbi: Thi\u00ean v\u0103n h\u1ecdc s\u00f3ng h\u1ea5p d\u1eabn.<\/li>\n\n\n\n
              • Hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 h\u1ed1 \u0111en, sao neutron, v\u00e0 s\u1ef1 gi\u00e3n n\u1edf v\u0169 tr\u1ee5.<\/li>\n\n\n\n
              • Ki\u1ec3m ch\u1ee9ng l\u00fd thuy\u1ebft t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 h\u01b0\u1edbng \u0111\u1ebfn l\u00fd thuy\u1ebft h\u1ea5p d\u1eabn l\u01b0\u1ee3ng t\u1eed.<\/li>\n<\/ul>\n\n\n\n

                5. K\u1ebft lu\u1eadn<\/strong><\/p>\n\n\n\n

                S\u00f3ng kh\u00f4ng ch\u1ec9 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng v\u1eadt l\u00fd \u2013 ch\u00fang l\u00e0 ng\u00f4n ng\u1eef c\u1ee7a v\u0169 tr\u1ee5. T\u1eeb nh\u1eefng dao \u0111\u1ed9ng nh\u1ecf nh\u1ea5t c\u1ee7a \u00e2m thanh \u0111\u1ebfn nh\u1eefng ch\u1ea5n \u0111\u1ed9ng l\u00e0m rung chuy\u1ec3n kh\u00f4ng-th\u1eddi gian, c\u00e1c lo\u1ea1i s\u00f3ng trong v\u1eadt l\u00fd gi\u00fap con ng\u01b0\u1eddi hi\u1ec3u, \u0111o l\u01b0\u1eddng v\u00e0 kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi.<\/p>\n\n\n\n

                S\u00f3ng h\u1ea5p d\u1eabn, v\u1edbi v\u1ebb b\u00ed \u1ea9n v\u00e0 h\u00f9ng v\u0129 c\u1ee7a n\u00f3, cho th\u1ea5y ch\u00fang ta m\u1edbi ch\u1ec9 \u0111ang ch\u1ea1m v\u00e0o ph\u1ea7n n\u1ed5i c\u1ee7a t\u1ea3ng b\u0103ng ki\u1ebfn th\u1ee9c. V\u1eadt l\u00fd hi\u1ec7n \u0111\u1ea1i v\u1eabn c\u00f2n r\u1ea5t nhi\u1ec1u \u0111i\u1ec1u \u0111\u1ec3 kh\u00e1m ph\u00e1.<\/p>\n\n\n\n

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