... hpinsttshpleft297tshptop2745tshpright10521tshpbott
om14985tshpfhdr0tshpbxcolumntshpbxignoretshpbyparat
shpbyignoretshpr3tshprk0tshpfbltxt0tshpz1tshplid102
7ItspItsn shapeTypeSItsv 202SSItspItsn fFlipHSItsv 0SSItspItsn fFlipVSItsv 0SSItspItsn lTxidSItsv 131072SSItspItsn lineColorSItsv 16777215SSItspItsn fLineSItsv 1SSItspItsn fLayoutInCellSItsv 0SSItspItsn fLayoutInCellSItsv 0SSItshptxt tltrpar tpardtplain tltrparts15tql tli0tri0tidctlpartaspalphataspnumtfaautotadjustrig
httrin0tlin0titap0 trtlchtfcs1 taf0tafs24talang1025 tltrchtfcs0 tf36tfs24tlang1033tlangfe2052tcgridtlangnp1033tlan
gfenp2052 Itrtlchtfcs1 taf0 tltrchtfcs0 tfs28tinsrsid4156876 Simpla descoperire a radioactivitatii de catre Henri Becquerel teen 1896 este teen prezent un fapt istoric, desigur important, dar lipsit de senzationalul produs la vremea respectiva.tpar Stpardtplain tltrpartql tli0tri0tidctlpartaspalphataspnumtfaautotadjustrig
httrin0tlin0titap0 trtlchtfcs1 taf0tafs20talang1025 tltrchtfcs0 tfs20tlang2057tlangfe2052tcgridtlangnp2057tlangfen
p2052 Itrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 Dar pana la urma ce este radioactivitatea tpar Radioactivitateaeste un fenomen nuclear. Unele nucleeemit spontan di interiorul lor particule sau radiatii care exista sau apar teen procese ce se petrec acolo. Prin urmare, asemenea nuclee sunt instabile sau SItrtlchtfcs1 taf0 tltrchtfcs0 titf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid
4156876 RADIOACTIVESItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 denumire uzuala . Fenomenul radioactivitatii, desi spontan nu se petrece teen afara timpului exista o durata de viata, numita viata medie, anucleelor unui element, tpar dupa care numarul nucleelor ramase nedezintegrate se reduce la aproximativ 1e din nr-ul nucleelor initiale. Viata medie este o marime cu caracter probabilistic si mai evident.tpar SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tinsrsid4156876 Astfel aceste nuclee radioactive au durata de viata mult mai mare decat duratele din microcosmos.Spre exemplu stim ca timpul nuclear, marime caracteristica domeniului nuclear, este de ordinul 10SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tsupertinsrsid4156876 -22SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tinsrsid4156876 -10SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tsupertinsrsid4156876 -23SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tinsrsid4156876 s. Fata de acesta, nucleul de U238 are o viata de aprox.10SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tsupertinsrsid4156876 10SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tinsrsid4156876 ani, ajungand ca nucleonii sa se roteasca de 10SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tsupertinsrsid4156876 38SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tinsrsid4156876 ori pe orbitele din nucleul lor, fara ca nucleul sa scape teen afara vreunul. tpar SItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 La urmatoarea rotatie teensa, se poate emite o particula SItrtlchtfcs1 taf0tafs28 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 ItfieldIttfldinst SYMBOL 97 ttf Symbol tts 14SItfldrslttf3tfs28SSSItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 compusa din patrunucleoni.tpar Astfel prin definitie SItrtlchtfcs1 taf0 tltrchtfcs0 titf36tfs28tultlang1033tlangfe2052tlangnp1033tinsr
sid4156876 nucleul radioactivSItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 este nucleul ce prezinta instabilitate si viata sa este cu mult mai mare decat timpul nuclear caracteristic. tpar Orice dezintegrare radioactiva a nucleelor este caracterizata prin constanta de dezintegrare SItrtlchtfcs1 taf0tafs28 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrsid41
56876 ItfieldIttfldinst SYMBOL 108 ttf Symbol tts 14SItfldrslttf3tfs28SSSItrtlchtfcs1 taf0 tltrchtfcs0 tf36tfs28tlang1033tlangfe2052tlangnp1033tinsrs ... Download