Assertion: effective cross section | /r/HasProperty | equal
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Source sentences:
text: If interaction between the colliding particles is strong and decreases rapidly with distance, the effective cross section as a rule is equal in order of magnitude to the square of the radius of action of the forces or to the geometric cross section of the system (see Figure 1); however, as a result of specific quantum-mechanical phenomena, the effective cross sections may differ considerably from these values (for example, in cases of resonance scattering and the Ramsauer effect).