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º¡Ãø 204
18, 2005

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å¾÷ ·§À¡÷ð (Ruther Ford )
 - Ө á Ţá, , , , ,  

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¢ ¨¡ .  ɡ Ţ ڸ Ȣ¡ Ȩ Ǣ Ŧ ġ.  Ũ¢ ĸ ȢԼ Ȧȡ . ϨȢ ĸ Ҹ (Nuclear Theory of Atom) Ǣ. 

âʉ Ȣ;   ţ (Radio-active) ž¢Ģ ը Ũ á 1908 ž¢ Ш측  â .

1871 30 亢ġ â ̧á â Ȣ.  ¾ħ Ȣ á .  , Ȣ , ž¢, Ǣ Ţɡ. 17 ¾ Ƹ 򦾡 ȡ.  ¾ħ èĸ (radio waves) Ȣ Ţ Ȣ Ψ Ũ.  1895 â Ƹ Ţ 򦾡 .  ʉ Ƹ ܼ á ţĢ . Ҹ Ţ Ȣá . . Ǣ ƢξĢ ¡Ȣ , ȡ Ҹ ȡ.

ţ ǢĢ Ũ¡ Ǣո .  Ũ (alpha rays) , (beta rays) .  Ǣ Ш Ţ ;  Ţ ġ (mass) Ţ (tiny nucleus) Ȣ.  ɧ Ȣ ǡ ɨ Ȣ Ǣ¢;  ɢ 츨 Ȣ ը 째 â.

1907 ɼŢĢ .  š¢ġ ¨ , ¨ Ȣ;  Ţ á Ũ¡ ο (neutral) Ȣ (gamma rays) .

1912 ɢ Ȣ ¢ (Neils Bohr) ռ á¢ Ţš Ţ Ţ, Ţ Ȣ .  1914 Ӿġ ĸ ;  Ţš ĸ ȢŢ Ȣ θ Ȣ .  ŢŢ.  ʉ ܼ .  ɢ즸 ɡ ɢ š¢ġ ȢŢ Ĩ Ţ ɡ .  à Ǣ и즸 ȢŢ Ţ .

1919 Ũ â Ƹ ʉ 쨸¢ á .. ;  Ţ쨸¢ á ȡ.  1925 Ӿ 1930 Ũ á Ƹ á Ţɡ.  ȢŢ 측 Ţи, â͸, áθ Ǣ, âʉ Ũ Ȣ á.

Ǣ¡ š쨸 š 1937 짼 19 ĸ š .  ׼ â Ŋ ¢ ļ . ȢŢ Ũ Ũ¢ 104 ɢ â ž¢ ĸ Ȣ Ǣ.

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