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3Â¥2008-09-28 12:05:43
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4Â¥2008-09-28 12:13:51
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´ÓÍøÉϸøÄãËѸö»ù±¾½éÉÜ¡£ÆäÊµËæ±ãÕÒ±¾Á¿×ÓÁ¦Ñ§Êé¶¼ÓнâÊ͵ģ¬¿ÉÒÔÈ¥¿´¿´¡£ÄǸö¹«Ê½ÖеÄhÔÚÔ×Óµ¥Î»ÖÐȡΪ1¾Í±ä³ÉÁËS**2=s(s+1) In quantum mechanics, the angular momentum of any system is quantized: its magnitude can only take values S**2=h**2s(s+1) where is the reduced Planck's constant, and the spin quantum number s is a non-negative integer or half-integer (0, 1/2, 1, 3/2, 2, etc.). The possibility of half-integer quantum numbers is a major difference between spin and orbital angular momentum; the latter can only take integer quantum numbers. The value of s depends only on the type of particle, and cannot be altered in any known way For instance, all electrons have s = 1/2. Other elementary spin-1/2 particles include positrons, neutrinos and quarks. Photons are spin-1 particles, and the hypothetical graviton is a spin-2 particle. The hypothetical Higgs boson is unique among elementary particles in having a spin of zero. [ Last edited by yuhuobuku on 2008-9-28 at 12:45 ] |

5Â¥2008-09-28 12:30:36
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6Â¥2008-09-28 15:37:29
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7Â¥2008-09-28 16:01:26
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8Â¥2008-09-28 16:19:03
xiaowandouer
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9Â¥2008-09-29 09:14:35
yuhuobuku
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- ½ð±Ò: 1661.1
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- ×¢²á: 2008-06-27
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10Â¥2008-09-29 09:18:27













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