FIZIKAS eksÄmena jautÄjumu atbildes - Fizmati
FIZIKAS eksÄmena jautÄjumu atbildes - Fizmati
FIZIKAS eksÄmena jautÄjumu atbildes - Fizmati
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>FIZIKAS</strong> eksāmena jautājumu <strong>atbildes</strong><br />
1 2 3 4 5 6 µ m<br />
volframs<br />
2. Stefana-Bolcmana likums (Stefans eksperim. 1879, Bolcmans teor. 1884)<br />
Pilnais starojums-<br />
∞<br />
Rm<br />
( T ) = ∫ rm<br />
( v,<br />
T ) dv = σ ⋅T<br />
σ<br />
B m<br />
4<br />
0<br />
−8<br />
−2<br />
−4<br />
−5<br />
−1<br />
−2<br />
= 5.67 ⋅10<br />
ω ⋅ m ⋅ k = 5.67 ⋅10<br />
⋅ erg ⋅ 3 cm k<br />
( T ) = σ<br />
π ⋅T<br />
4<br />
1000 K 5.7 w/cm 2<br />
2000 K 91.2 w/cm 2<br />
6000 K 7287 w/cm 2<br />
5800 K (saules virsmas temperatūra) 6500 w/cm 2<br />
3. Vīna pārbīdes likums<br />
λ ⋅ T = 2898µ<br />
m ⋅ K<br />
max<br />
λ<br />
max<br />
⋅T<br />
= 2.9 ⋅10<br />
−3<br />
m ⋅ K<br />
Temperatūrai mainoties, mainās arī krāsa.<br />
r( λ , T )<br />
6000 K (Saule)<br />
−4<br />
2760 K (lampa)<br />
1930 K (sveces gaisma)<br />
1 2 3 4<br />
redzamā daļa<br />
998 K<br />
λ, µ m<br />
Neviena formula nederēja visam spektram, bet tikai daļēji.<br />
4. Planka likums (1900)<br />
Šis darbs ir nācis no http://datzb.intelctuals.net/ - LU FMF DatZB Darbu Arhīva 41/41<br />
©2002-2003 DatZB Team
Change language