Module 4
Electrons, Waves, and photons
OCR A A-level physics
•
Electron Drift Velocity I = nave
Rz
• Potential Divider ✓out
= Vin
R, t Rz
• Power Equations Starting from P= ¾ into P= IV etc
• Resistors in series RT = Ri + R2 + Rs ....
• Resistors in parallel _Ip, = 1, + Rz OR Rt - (¼ + &)'
• Snell's haw ① = Sin" (¾)
• Young's Double Slit ✗ = 9
• Diffraction Grating dsina = nx
• De Broglie's Wavelength ✗ =! = ½p
, e- e- é e- e-
A e-
é
é é é
T
Deriving I = nave Q = It
- Ne (electron
n = number of charge carriers per m³ N= nv numbers)
nV = Total number of charge carriers
NVe = Total charge (Q = male)
① Q = It ① = Ne
Ne = IE
② Ne-It and N=nv
nve = It
rearrange to get I= nve
cross-sectional area ✗ length
③ change V to V= AL
⟂ = Male
∈
④ Sub in v= ¼ (= VE
I = nAu t e
∈ cancels out
- = have
Electrons, Waves, and photons
OCR A A-level physics
•
Electron Drift Velocity I = nave
Rz
• Potential Divider ✓out
= Vin
R, t Rz
• Power Equations Starting from P= ¾ into P= IV etc
• Resistors in series RT = Ri + R2 + Rs ....
• Resistors in parallel _Ip, = 1, + Rz OR Rt - (¼ + &)'
• Snell's haw ① = Sin" (¾)
• Young's Double Slit ✗ = 9
• Diffraction Grating dsina = nx
• De Broglie's Wavelength ✗ =! = ½p
, e- e- é e- e-
A e-
é
é é é
T
Deriving I = nave Q = It
- Ne (electron
n = number of charge carriers per m³ N= nv numbers)
nV = Total number of charge carriers
NVe = Total charge (Q = male)
① Q = It ① = Ne
Ne = IE
② Ne-It and N=nv
nve = It
rearrange to get I= nve
cross-sectional area ✗ length
③ change V to V= AL
⟂ = Male
∈
④ Sub in v= ¼ (= VE
I = nAu t e
∈ cancels out
- = have
