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--- classes:2009:fall:phys4101.001:q_a_1009 [2009/10/21 11:01] – czhang
+++ classes:2009:fall:phys4101.001:q_a_1009 [2009/10/22 12:21] (current) – czhang
@@ Line 182: / Line 182: @@
 Why is k a known for a scattering problem?
+===Can 10/22 12:15pm ===
+Since for scattering problem <math>E=\frac{h^2k^2}{2m}</math> which means <math>k=\frac{\sqrt{2mE}}{h}</math>, and E is the incident energy of the particle, which can be manually tuned. E is known , so k is known.
 ====Aspirin 10/12, 2:30pm====