Summary

• Millikan oil drop experiment
• Blackbody radiation
• Photoelectric effect
• X ray production

• The Compton effect
• X ray scattering
• Conserve energy
• Conserve momentum
• particle-like photons
• Example problem 3.50



• Pair production and annihilation
• Energy → mass
• Mass → energy
• Photon energy example problem 3.57

Thornton5e 3.50
An instrument (spectrometer) has resolution Δλ/λ = 0.40%. What wavelength of incident photons should be used in order to resolve the modified and unmodified scattered photons for scattering angles of (a) 30°, (b) 90°, and (c) 170°. Each the following EXCEPT:
A. 1204 pm
B. 812.5 pm
C. 606.5 pm
D. 81.25 pm
Answer























Thornton5e 3.57
A typical person can detect light with a minimum intensity of 4.0×10⁻¹¹ W/m². For light of this intensity and λ = 550 nm, how many photons enter the eye each second if the pupil is wide open with a diameter of 9.0 mm?
A. 86.4 photons/s
B. 612 photons/s
C. 7,050 photons/s
D. 86,400 photons/s
Answer























 



B. 812.5 pm

See published example sheet on Canvas.




























 



C. 7,050 photons/s

See published example sheet on Canvas.