# Answer to Question #67227 in Quantum Mechanics for urvashi

Question #67227

Plank's equation is E= hf f= E/h E-energy = Â½mvÂ², h- plank's constant, f - frequency. Î»f = v Î»= v/ f = vh/ E = 2h/p P- momentum = mv

but de broglie equation is Î» = h/p. Why?

but de broglie equation is Î» = h/p. Why?

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