test.py

Created by vieirajerome31

Created on October 01, 2024

636 Bytes

//1 La lumière visible est une
onde électromagnétique 6 E = h × f
2 Une onde de longueur d'onde λ
= 1,0 μm appartient au
domaine de l'infrarouge (IR)
7
E =
h. c
λ
= h ×
c
λ
3
λ = c × T =
c
f
⇔ λ × f = c ⇔ f =
c
λ
8
La constante de Planck h 
s'exprime en J.s
4 La vitesse de la lumière 
dans le vide ou dans l'air a 
pour
valeur et unité : c = 3,00.108m.s-1 = 3,00.105
km.s-1
9 Plus la longueur d'onde d'un photon est petite, plus son
énergie est grande !
5 f = 3,5.1010 Hz = 3,5.10 GHz = 35.106
kHz 10
E =
1,27. 10−18J
1,6. 10−19J.ev−1 = 7,9e


f = c/ λle resultat en hz

rendement = energie utile / 
energie absorbée

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