Experimental verification Classical analogy

Bouncing a highly elastic ball off a stone wall. No energy is transferred to the wall. The ball will come back with the same speed, at an angle determined by the angle of incidence.

intensity

L

\ d = 45o

V

\ AA= 0.7 x 10-3 nm

AA

wavelength

Figure 13.9 Wavelength displacement of X-rays from a molybdenum Ka line scattered from carbon.

wavelength

Figure 13.9 Wavelength displacement of X-rays from a molybdenum Ka line scattered from carbon.

Colliding in mid-flight with another ball. The original ball will lose energy. The greater the angle of scatter, the greater the energy transferred to the other ball.

The photon has both energy and momentum, just like any other particle. After the experimental confirmation of the theoretical model of Compton scattering, the existence of light quanta could hardly be questioned.

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