Imibuzo Eyisibonelo Exoxa Ngomlando Wokutholwa Kwe-Atomic Nucleus
Ukutholakala kwe-nucleus ye-athomu kwakuyingqophamlando ebalulekile emlandweni wesayensi, kwaguqula ukuqonda kwethu isakhiwo sezinto. Lesi senzakalo asizange sinikeze nje kuphela ukuqonda okusha ngokwakheka kwama-athomu kodwa futhi savula indlela yokuthuthukiswa kwe-physics kanye ne-chemistry yesimanje. Kulesi sihloko, sizohlola umlando wokutholakala kwe-nucleus ye-athomu, sibukeze ezinye izivivinyo ezibalulekile, futhi sixoxe ngezinye zezinkinga eziyisibonelo ukuze sijulise ukuqonda kwethu ngalesi sihloko.
Umlando Wokutholwa Kwe-Atomic Nucleus
Ucwaningo ngesakhiwo se-athomu ludlule ezigabeni eziningana ezibalulekile. Ngaphambi kokutholakala kwe-nucleus ye-athomu, imodeli ye-athomu eyamukelwa kakhulu kwakuyimodeli ethi “i-plum pudding” eyaphakanyiswa ngu-J.J. Thomson ngemuva kokuthola kwakhe i-electron ngo-1897. Le modeli yayicabanga ukuthi i-athomu iyindilinga eshajeke kahle enama-electron ashajeke kabi asakazeke nxazonke, njengezithelo zomvini e-pudding.
Kodwa-ke, lo modeli wagxekwa futhi ekugcineni wathathelwa indawo yimodeli yenuzi ye-athomu ngenxa yokuhlolwa okwenziwa ngu-Ernest Rutherford nozakwabo, uHans Geiger no-Ernest Marsden, ekuqaleni kwekhulu lama-20. Lokhu kuhlolwa kwaziwa ngokuthi ukuhlolwa kokusabalalisa kukaRutherford noma ukuhlolwa kwe-gold foil.
Ukuhlolwa Kwamaqabunga Egolide
Lokhu kuhlolwa kwenziwa ngo-1909 eNyuvesi yaseManchester. Kulokhu kuhlolwa, uRutherford nethimba lakhe bakhipha izinhlayiya ze-alpha (eziyi-helium nuclei) baya ku-foil encane yegolide. Izinhlayiya ze-Alpha zaziwa ngokuba ne-chaji enhle kanye nobunzima obukhulu. Ngokusho kwemodeli kaThomson ethi "plum pudding", kwakulindeleke ukuthi izinhlayiya ze-alpha zidlule ku-foil yegolide ngokuphambuka okuncane noma okungekho nhlobo okuphawulekayo.
Kodwa-ke, imiphumela yokuhlola ibonise okuhlukile. Ngenkathi izinhlayiya eziningi ze-alpha zidlula ku-foil yegolide zingashintshi, inani elincane laphambuka ngama-engeli amakhulu kakhulu, kanti ezinye zaze zabuyela emuva emthonjeni. Lokhu kubonwa akukwazanga ukuchazwa yimodeli kaThomson.
Imodeli Ye-Atomic KaRutherford
Kusukela ekuhlolweni kwakhe, uRutherford waphetha ngokuthi iningi lesisindo se-athomu kanye nayo yonke i-charging yayo enhle yayigxile endaweni encane enkabeni ye-athomu, manje eyaziwa ngokuthi i-nucleus. Ama-electron ashaje kabi ajikeleza le nucleus, njengoba nje amaplanethi ejikeleza ilanga. Lokhu kutholwa kwashintsha indlela okwaholela ososayensi ekuqondeni i-athomu hhayi njengesiyingi esiqinile kodwa njengesakhiwo esakhiwe kakhulu isikhala esingenalutho esine-nucleus encane, eqinile enkabeni yaso.
Imibuzo Eyisibonelo Nengxoxo
Ukuze siqonde kangcono lokhu okutholiwe, ake sibheke ezinye zezibonelo zezinkinga ezihlobene nomlando kanye nemiphumela yokutholakala kwe-nucleus ye-athomu.
Umbuzo 1:
Chaza ukuthi ukuhlolwa kukaRutherford nge-gold foil kwahluke kanjani kumodeli ethi “plum pudding” ye-athomu eyaphakanyiswa nguJ.J. Thomson nokuthi imiphumela yayisekela kanjani imodeli ye-athomu kaRutherford.
Ingxoxo:
Imodeli ethi “plum pudding” ibona i-athomu njengendilinga eshajeke kahle enama-electron asakazwe ngokulinganayo kuyo yonke indawo. Kulo modeli, inhlayiya ye-alpha eshaywe yi-foil yegolide akufanele ibhekane nokuphambuka okukhulu ngoba kukholakala ukuthi amacala amahle nangalungile asatshalaliswa ngokulinganayo kuyo yonke i-athomu.
Kodwa-ke, ukuhlolwa kwe-foil yegolide kaRutherford kubonise ukuthi izinhlayiya ze-alpha azikwazanga ukudlula kuphela kufoil yegolide, kodwa futhi zaziphambukile ngama-engeli amakhulu futhi zaze zabonakala. Lo mphumela uphonsela inselelo imodeli ethi "plum pudding" futhi wasekela imodeli lapho i-athomu yayinesikhungo esiqinile, esine-charged positive (i-nucleus). Izinhlayiya eziningi ze-alpha zadlula esikhaleni esingenalutho se-athomu, kodwa lapho zishaya i-nucleus, zaphambukile kakhulu, okuchaza okubonwe.
Umbuzo 2:
Uma ekuhlolweni kwe-gold foil, iphesenti lezinhlayiya ze-alpha ezabuyela emuva eduze komthombo lalilincane, kungani lo mphumela wawubalulekile ekusekeleni ukutholakala kwe-nucleus ye-athomu?
Ingxoxo:
Nakuba kuboniswe iphesenti elincane kuphela lezinhlayiya ze-alpha, lo mphumela ubalulekile. Lokhu kungenxa yokuthi amathuba okuthi inhlayiya ye-alpha iphambukiswe noma ibuyiselwe emuva kungenzeka kuphela uma ishayisana ngqo nento enkulu kakhulu futhi ishajeke kahle. Njengoba kuboniswe iphesenti elincane kuphela lezinhlayiya, lokhu kubonisa ukuthi inhlayiya enkulu incane kakhulu uma iqhathaniswa nosayizi ophelele we-athomu, ngaleyo ndlela kufakazela ukuthi iningi lesisindo se-athomu ligxile ku-nucleus.
Umbuzo 3:
Chaza imiphumela yokutholakala kwe-nucleus ye-athomu ekuthuthukisweni kwesayensi, ikakhulukazi emikhakheni yefiziksi kanye nekhemistri.
Ingxoxo:
Ukutholakala kwe-nucleus ye-athomu kwavula indlela yentuthuko eyengeziwe kwi-physics yenuzi kanye ne-quantum chemistry. Kwanikeza ukuqonda okungcono kokusabela kwamakhemikhali kanye nokucushwa kwama-electron ngaphakathi kwama-athomu. Ku-physics, lokhu kwaholela ekuthuthukisweni kwamamodeli e-athomu anembe kakhudlwana, okwaholela uNiels Bohr ukwethula imodeli ye-Bohr ye-athomu, eyayichaza kangcono imijikelezo yama-electron.
Ngaphezu kwalokho, ukuqonda i-nucleus ye-athomu kwaholela ekutholakaleni kwama-isotopes, ukusabela kwe-nuclear, kanye nobuchwepheshe bamandla enuzi. Ukumodela kwe-nuclear nakho kubalulekile ekuqondeni izimo ze-radioactivity kanye nokubola kwe-nuclear, okusebenza kwezokwelapha, emvelweni, kanye nobuchwepheshe.
Isiphetho
Ukutholakala kwe-nucleus ye-athomu kwakuyingqophamlando kwezesayensi engasisizanga nje kuphela ukuqonda isakhiwo esiyisisekelo sezinto kodwa futhi yakhuthaza ukusungulwa kwezobuchwepheshe kanye nemibono esasebenza nanamuhla. Ngokutadisha izenzakalo ezibalulekile njengokuhlolwa kwe-gold foil kaRutherford, singabona ukuthi ukuhlola kwesayensi kwasunduza kanjani imingcele yolwazi futhi kwavula indlela yokuqonda okujulile kwendawo yonke yethu. Ukufunda ngezinkinga ezihlobene kuvumela abafundi nothisha ukuthi baqinise le mibono eyinhloko ezimweni zomlando nezesayensi.
