{"id":8938,"date":"2009-11-13T20:01:02","date_gmt":"2009-11-13T18:01:02","guid":{"rendered":"http:\/\/www.lovendal.net\/wp52\/?p=8938"},"modified":"2009-11-14T21:28:02","modified_gmt":"2009-11-14T19:28:02","slug":"ce-este-cu-adevarat-lumina-o-enigma-a-fizicii-putin-descifrata","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/ce-este-cu-adevarat-lumina-o-enigma-a-fizicii-putin-descifrata\/","title":{"rendered":"Ce este cu adev\u0103rat lumina? O enigm\u0103 a fizicii pu\u0163in descifrat\u0103"},"content":{"rendered":"

\"viteza<\/a>Pentru un observator care chiar c\u0103l\u0103tore\u015fte cu viteza luminii, ecua\u0163iile relativit\u0103\u0163ii speciale prezic faptul c\u0103 timpul ar ajunge \u00eentr-un punct complet sta\u0163ionar \u015fi lungimea s-ar mic\u015fora la zero. Fizicienii de obicei evit\u0103 s\u0103 ia \u00een considera\u0163ie aceast\u0103 stare ciudat\u0103 a lucrurilor spun\u00e2nd c\u0103 nimic nu poate atinge viteza luminii, a\u015fa c\u0103 nu trebuie s\u0103 ne facem griji pentru lucrurile bizare care s-ar putea \u00eent\u00e2mpla la acea vitez\u0103.<\/p>\n

Nu se poate atinge viteza luminii din cauza masei<\/strong><\/p>\n

Atunci c\u00e2nd fizicienii spun c\u0103 nimic nu poate atinge viteza luminii, se refer\u0103 la obiectele care au mas\u0103. Einstein a ar\u0103tat nu numai c\u0103 spa\u0163iul \u015fi timpul se schimb\u0103 pe m\u0103sur\u0103 ce cre\u015fte viteza, ci \u015fi c\u0103 masa face la fel. \u00cen cazul masei, totu\u015fi, schimbarea este mai degrab\u0103 o cre\u015ftere dec\u00e2t o descre\u015ftere; cu c\u00e2t ceva se mi\u015fc\u0103 mai repede, cu at\u00e2t mai mare \u00eei devine masa. Dac\u0103 un obiect ar atinge vreodat\u0103 viteza luminii, masa sa ar deveni infinit\u0103. Cu toate acestea, s\u0103 mi\u015fti o mas\u0103 infinit\u0103 ar necesita o cantitate infinit\u0103 de energie, mai mult\u0103 energie dec\u00e2t exist\u0103 \u00een \u00eentreg universul. Prin urmare se afirm\u0103 ca nimic nu poate atinge viteza luminii. Adic\u0103 nimic \u00een afar\u0103 de lumin\u0103. Lumina c\u0103l\u0103tore\u015fte la viteza luminii. \u015ei o poate face pentru c\u0103 nu este un obiect material; masa sa este \u00eentotdeauna exact zero.<\/p>\n

Lumina exist\u0103 \u00een eternitate<\/strong><\/p>\n

Din moment ce lumina c\u0103l\u0103tore\u015fte cu viteza luminii, haide\u0163i s\u0103 ne imagin\u0103m un observator f\u0103r\u0103 corp (minte pur\u0103 f\u0103r\u0103 mas\u0103) c\u0103l\u0103torind cu viteza luminii. Ecua\u0163iile lui Einstein ar prezice c\u0103, din punctul de vedere al luminii, ea nu parcurge nicio distan\u0163\u0103 \u015fi \u00eei ia zero timp s\u0103 o fac\u0103. Acest lucru ne \u00eendreapt\u0103 aten\u0163ia spre ceva cu adev\u0103rat straniu despre lumin\u0103. Orice ar fi lumina, se pare c\u0103 exist\u0103 pe un t\u0103r\u00e2m unde nu exist\u0103 un \u00eenainte sau un dup\u0103. Exist\u0103 doar un acum.<\/p>\n

De ce corpurile care str\u0103lucesc \u00ee\u015fi schimb\u0103 culoarea?<\/strong><\/p>\n

Mai multe indicii despre ce este lumina – \u015fi despre ceea ce nu este – se g\u0103sesc \u00een cealalt\u0103 mare schimbare de paradigm\u0103 din fizica modern\u0103, teoria cuantic\u0103. Ca \u015fi \u00een cazul relativit\u0103\u0163ii, anomalia care a declan\u015fat aceast\u0103 schimbare viza lumina.
\nAtunci c\u00e2nd cre\u015fti temperatura unei bare de metal, ea cap\u0103t\u0103 o str\u0103lucire de un ro\u015fu plat. Pe m\u0103sur\u0103 ce se \u00eenc\u0103lze\u015fte mai tare, culoarea se intensific\u0103 \u015fi se schimb\u0103 din ro\u015fu \u00een portocaliu, apoi \u00een alb \u015fi \u00een final cap\u0103t\u0103 o nuan\u0163\u0103 alb\u0103struie. De ce se \u00eent\u00e2mpl\u0103 asta?<\/p>\n

Conform fizicii clasice, toate corpurile care str\u0103lucesc ar trebui s\u0103 radieze aceea\u015fi culoare, indiferent de temperatur\u0103.
\n\u00cen 1900, fizicianul german Max Planck \u015fi-a dat seama c\u0103 ar putea explica aceste schimb\u0103ri de culoare dac\u0103 energia nu ar fi radiat\u0103 \u00eentr-un flux lin \u015fi continuu, a\u015fa cum se presupunea \u00eenainte, ci ar veni \u00een pachete discrete sau cuante (din latinescul quantum, \u00eensemn\u00e2nd \u201ecantitate”). El a sus\u0163inut c\u0103 orice schimb de energie, fie c\u0103 e un electron dintr-un atom care-\u015fi schimb\u0103 orbita, fie c\u0103 e \u00eenc\u0103lzirea pielii la expunerea la soare, const\u0103 dintr-un num\u0103r de cuante \u00eentregi. Schimbul de energie poate s\u0103 includ\u0103 1,2,5 sau 117 de cuante; dar nu jum\u0103tate de cuantum sau 3.6 de cuante. Atunci c\u00e2nd Planck a aplicat aceast\u0103 constr\u00e2ngere la lumina radiat\u0103 de un obiect care str\u0103luce\u015fte, a descoperit c\u0103 duce precis la schimb\u0103rile de culoare observate.<\/p>\n

Lumina e format\u0103 din pachete de energie<\/strong><\/p>\n

Cinci ani mai t\u00e2rziu, \u00een acela\u015fi an \u00een care a publicat teoria sa de relativitate special\u0103, Einstein a ajuns la o concluzie similar\u0103. El explora efectul fotoelectric nou-descoperit, \u00een care lumina care str\u0103luce\u015fte pe un metal poate declan\u015fa eliberarea de electroni. Singurul mod prin care putea explica rata la care ap\u0103reau electronii a fost s\u0103 presupun\u0103 c\u0103 lumina este transmis\u0103 ca un r\u00e2u de particule sau de fotoni. Fiecare dintre ace\u015fti fotoni era echivalent cu o cuant\u0103 de-a lui Planck sau pachete de energie.<\/p>\n

Un cuantum poate fi cel mai mic pachet de energie care poate fi transmis, dar energia con\u0163inut\u0103 de un cuantum variaz\u0103 considerabil. Un foton de raze gama, spre exemplu, \u00eenglobeaz\u0103 energie de miliarde de ori mai mare dec\u00e2t un foton infraro\u015fu. Acesta este motivul pentru care sunt at\u00e2t de periculoase razele gama, razele X \u015fi chiar lumina ultraviolet\u0103, \u00eentr-o anumit\u0103 m\u0103sur\u0103. Atunci c\u00e2nd ace\u015fti fotoni se \u00eent\u00e2lnesc cu trupul t\u0103u, energia eliberat\u0103 poate s\u0103 distrug\u0103 moleculele unei celule. Pe de alt\u0103 parte, atunci c\u00e2nd un foton infraro\u015fu este absorbit de c\u0103tre corp, energia eliberat\u0103 este mult mai mic\u0103; tot ce face este s\u0103 provoace vibra\u0163ia moleculelor \u00eenc\u0103lzindu-te pu\u0163in.<\/p>\n

Constanta lui Planck<\/strong><\/p>\n

De\u015fi cantitatea de energie dintr-un foton variaz\u0103 enorm, exist\u0103 un singur aspect fix al cuantumului. Fiecare cuantum are o cantitate constant\u0103 de ac\u0163iune. Matematicienii definesc ac\u0163iunea ca momentumul unui obiect multiplicat de distan\u0163a pe care o parcurge, sau energia obiectului multiplicat\u0103 cu timpul pe care \u00eel petrece – cele dou\u0103 sunt echivalente. Cantitatea de ac\u0163iune dintr-o minge aruncat\u0103 de-a lungul unui teren de fotbal, spre exemplu, ar fi mai mare dec\u00e2t aceea\u015fi minge aruncat\u0103 la jum\u0103tate din aceast\u0103 distan\u0163\u0103. Dac\u0103 dublezi masa mingii, dublezi ac\u0163iunea. Sau imagina\u0163i-v\u0103 c\u0103 alerga\u0163i cu o rat\u0103 constant\u0103 de eliberare de energie. Dac\u0103 alerga\u0163i de dou\u0103 ori mai mult, ac\u0163iunea se va dubla – ceea ce are sens \u00een planul intuitiv.<\/p>\n

Cantitatea de ac\u0163iune dintr-un cuantum este exagerat de mic\u0103, de aproximativ 662618 * 10 la puterea -27 erg.secunde – dar este \u00eentotdeauna exact aceea\u015fi cantitate. Aceasta se nume\u015fte constanta lui Planck (dup\u0103 descoperitorul ei). Este a doua constant\u0103 universal\u0103 care ia na\u015ftere din fizica modern\u0103. Ca \u015fi prima – viteza luminii -este o constant\u0103 de lumin\u0103. Lumina \u00eentotdeauna apare \u00een unit\u0103\u0163i identice de ac\u0163iune.<\/p>\n

Lumina este dincolo de spa\u0163iu \u015fi de timp<\/strong><\/p>\n

Ca \u015fi relativitatea, teoria cuantic\u0103 indic\u0103 faptul c\u0103 lumina este dincolo de spa\u0163iu \u015fi timp. Ne putem g\u00e2ndi la foton ca fiind emis dintr-un punct oarecare din spa\u0163iu care c\u0103l\u0103tore\u015fte spre alt punct unde este absorbit. Dar teoria cuantic\u0103 spune c\u0103 nu \u015ftim ce se \u00eent\u00e2mpl\u0103 pe drum. Nici nu putem afirma c\u0103 fotonul exist\u0103 \u00eentre cele dou\u0103 puncte. Tot ce putem spune este c\u0103 exist\u0103 un punct de emisie, un punct corespondent de absorb\u0163ie \u015fi transferul unei ac\u0163iuni de o unitate \u00eentre cele dou\u0103.<\/p>\n

Kant a afirmat c\u0103 noumenul – \u201elucrul-\u00een-sine”, realitatea fizic\u0103 re\u0163inut\u0103 de sim\u0163uri \u015fi interpretat\u0103 de minte, dar niciodat\u0103 experimentat\u0103 direct \u2014 transcende spa\u0163iul \u015fi timpul.<\/p>\n

O sut\u0103 dou\u0103zeci de ani mai t\u00e2rziu \u00eel g\u0103sim pe Einstein care \u00eel sus\u0163ine pe Kant. Timpul \u015fi spa\u0163iul nu sunt absolute. Ele nu sunt dec\u00e2t dou\u0103 apari\u0163ii diferite ale unei realit\u0103\u0163i mai ad\u00e2nci, continuumul spa\u0163iu-timp – ceva dincolo \u015fi de spa\u0163iu \u015fi de timp, dar cu poten\u0163ialul de a se manifesta ca spa\u0163iu \u015fi timp. Dar continuumul spa\u0163iu-timp \u00een sine, ca \u015fi noumenul lui Kant, nu este cunoscut direct.<\/p>\n

Nu putem vedea niciodat\u0103 lumina \u00een sine<\/strong><\/p>\n

Lumina are \u015fi ea calit\u0103\u0163i pe care nu le putem cunoa\u015fte. Nu vedem niciodat\u0103 lumina \u00een sine. Lumina care love\u015fte ochiul este cunoscut\u0103 doar prin energia pe care o elibereaz\u0103. Aceast\u0103 energie se transform\u0103 \u00eentr-o imagine vizual\u0103 \u00een minte. De\u015fi imaginea pare s\u0103 fie compus\u0103 din lumin\u0103, lumina pe care o vedem este o calitate care apare \u00een con\u015ftiin\u0163\u0103. Ceea ce e lumina de fapt, nu \u015ftim direct.<\/p>\n

Lumina pare s\u0103 fie dincolo de ra\u0163iune \u015fi de \u00een\u0163elegerea sim\u0163ului comun, o descoperire care din nou e o paralel\u0103 la concluziile lui Kant. Ra\u0163iunea, a spus el, nu este o calitate intrinsec\u0103 a noumenului, ci, ca \u015fi spa\u0163iul \u015fi timpul, face parte din modul \u00een care mintea d\u0103 un sens lucrurilor. Dac\u0103 e a\u015fa, n-ar trebui s\u0103 fie surprinz\u0103tor c\u0103 min\u0163ilor noastre le e at\u00e2t de greu s\u0103 \u00een\u0163eleag\u0103 natura luminii. E posibil s\u0103 nu fim niciodat\u0103 capabili s\u0103 \u00een\u0163elegem natura luminii. Cu lumina, s-ar putea s\u0103 fi atins limita capacit\u0103\u0163ilor noastre de cunoa\u015ftere.<\/p>\n

\"de-la-stiinta-la-dumnezeu-site\"<\/a>(Fragment din cartea PETER RUSSELL \u2013 \u201cDe la stiinta la Dumnezeu\u201d<\/em>). Aceast\u0103 carte minunat\u0103 o pute\u0163i cump\u0103ra de AICI: http:\/\/www.librarie.almeea.com\/peter-russell-de-la-stiinta-la-dumnezeu\/<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Pentru un observator care chiar c\u0103l\u0103tore\u015fte cu viteza luminii, ecua\u0163iile relativit\u0103\u0163ii speciale prezic faptul c\u0103 timpul ar ajunge \u00eentr-un punct complet sta\u0163ionar \u015fi lungimea s-ar mic\u015fora la zero. Fizicienii de obicei evit\u0103 s\u0103 ia \u00een considera\u0163ie aceast\u0103 stare ciudat\u0103 a … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":8939,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[610,348,2524,1916,952,2523,9803,1104],"class_list":["post-8938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-einstein","tag-fizica","tag-fizica-cuantica","tag-kant","tag-lumina","tag-planck","tag-stiinta","tag-teoria-relativitatii","resize-featured-image"],"yoast_head":"\nCe este cu adev\u0103rat lumina? 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