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Formelsamling B-niveau projekt [pdf] - sorenr.dk

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November 2003 <strong>Formelsamling</strong> Fysik B-<strong>niveau</strong> Side 35<br />

14 Atomfysik<br />

Atomkernens opbygning<br />

Nukleontallet A protoner adderet neutroner<br />

A<br />

ZX N<br />

Protontallet Z<br />

Neutrontallet N<br />

A = Z+ N<br />

Atomets navn X<br />

Fotoelektrisk effekt<br />

Fotoner<br />

f<br />

W<br />

h<br />

Grænsefrekvensen 0 f [ Hz ]<br />

L<br />

0 = Løsrivelsesarbejde L<br />

= ⋅ Plancks konstant<br />

−19<br />

1eV 1,602 10 J<br />

E<br />

foton<br />

Energi<strong>niveau</strong>er<br />

h⋅c =<br />

λ<br />

( W L = en konstant for et givet metal)<br />

W [ eV ]<br />

= ⋅ [ eV ⋅ s]<br />

15<br />

h 4,136 10 −<br />

Fotonenergi E foton<br />

[ eV]<br />

Plancks konstant<br />

Lysets hastighed<br />

= ⋅ [ eV ⋅ s]<br />

15<br />

h 4,136 10 −<br />

8<br />

c= 3,0⋅ 10<br />

⎡m ⎤<br />

⎢<br />

⎣ s ⎥<br />

⎦<br />

c<br />

λ=<br />

f<br />

Bølgelængde λ [ m ]<br />

Frekvens f [ Hz ]<br />

E<br />

Løsrivelsesarbejde<br />

n 2<br />

Stof W = [ eV]<br />

Sølv (Ag) 4,26<br />

Guld (Au) 5,10<br />

Kobber (Cu) 4,65<br />

Zink (Zn) 3,63<br />

Kalium (K) 2,30<br />

Energi i skal nr. n En [ eV]<br />

h⋅c⋅R =<br />

n<br />

Konstanter h c R 13,61<br />

Atomets skal nr. n<br />

L<br />

⋅ ⋅ = [ eV ]

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