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ID number:167984
Author:
Evaluation:
Published: 08.05.2007.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Pētot fotoefektu, jānoskaidro, no kā ir atkarīgs
1)no vielas izrauto elektronu skaits
2)šo elektronu ātrums.

1 – gaismu necaurlaidīgs balons
2 – kvarca plāksnīte
3;4 – plakani elektrodi
5 – potenciometrs
Voltampēru raksturlīkne
Attēlo starpelektrodu telpā plūstošās strāvas atkarību no sprieguma
Palielinoties spriegumam, pieaug arī strāvas stiprums
Oma likums nav spēkā
Ja spriegumu turpina palielināt, tad strāvas stiprums pieaug arvien mazāk.

Sākot ar noteiktu sprieguma vērtību Us, strāvas stiprums ir sasniedzis maksimālo vērtību Is un vairāk nemainās. Šo strāvas stipruma vērtību sauc par sātstrāvu.
Iestājoties sātstrāvai, visi elektroni, kurus vienā sekundē izrauj gaisma no negatīvi lādētā elektroda, nokļūst pie pozitīvi lādētā elektroda.…

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