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<strong>Zbirka</strong> <strong>zadataka</strong> <strong>iz</strong> f<strong>iz</strong>ike Mr V. Drinčić<br />
12.8. Koliku talasnu dužinu treba da ima foton da bi jon<strong>iz</strong>ovao helijumov atom <strong>iz</strong> osnovnog<br />
stanja?<br />
hc<br />
22,<br />
8 nm<br />
2<br />
Z 13,<br />
6 eV<br />
235<br />
12.9. Koliko ima protona a koliko neutrona u jezgru 92 U ?<br />
Redni broj Z je broj protona a broj neutrona je N = A – Z = 235 – 92 = 143<br />
4<br />
12.10. Koliko ima protona, koliko neutrona i koliko elektrona u masi od 1g 2 He ?<br />
U m = 1 g nalazi se<br />
N<br />
mN<br />
A atoma. Za M = 4g/mol, N = 1,510 23 atoma.<br />
M<br />
12.69
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