Compton Effect

Zoë O’Malley

Michael Ross

Brandon Bernard

EM Spectrum

A range of electromagnetic frequencies, which include:

Infra red Visible Light Ultra violet X-rays

Photon

Also known as a ‘photoelectron’.

A quantifiable “EM particle”, described as a “discrete energy packet” by Albert Einstein.

Compton Effect

‘Photon-electron’ interactions within a mass results in a reduced wavelength (λ) of the photon, as well as the scattering of both the photon and electron.

This can also be explained by saying that ‘p-e’ interactions obey the laws of conservation of energy as well as momentum.

http://buphy.bu.edu/~duffy/semester2/c35_compton.html

Conservation of Energy

V=ƒλ or C=ƒλ or λ=C/ƒ

1. ET = E‘T

2. Ep + Ee¯ = E’p + E’e¯ + Er

Ee¯ ≈ 0 ‘initial energy of e¯

Er ≈ 0 ‘energy required to release e¯ from mass

Conservation of Energy

3. Ep = E’p + E’e¯

Ep = hƒ ‘h is Plank’s constant, ƒ is frequency

4. hƒ = hƒ’ + E’e¯

E’e¯ = ½mv2 ‘kinetic energy, moving mass

5. hƒ = hƒ’ + ½(me¯)(v’e¯)2

Conservation of Momentum

1. p = mvp

E = mc2 or m = E/C2

Vp = C

2. p = E/C2 • C

3. P = E/C

E = hƒ

Conservation of Momentum4. P = ƒh/C

V = ƒλ or ƒ = V/λ or ƒ = C/λ

5. P = C/λ • h/C

6. P = h/λ

7. h/λ = h/λ’ + Me¯Ve¯

h = 6.6260755 x 10-34 J•S

Formulas & Constants

λ=C/ƒ

hƒ = hƒ’ + ½(me¯)(v’e¯)2

h/λ = h/λ’ + Me¯V e¯

h = 6.6260755 x 10-34 J•S

Homework

Pg. 857 #5-9

Bibliography

Zitsewitz, Paul, Mark Davids, and Robert Neff. Physics. Ontario: Maxwell MacMillan Canada, 1992.

Edwards, Lois, et al. Physics. Canada: McGraw-Hill Ryerson, 2003.

http://www.launc.tased.edu.au/online/sciences/physics/compton.html