Physics 6C. De Broglie Wavelength Uncertainty Principle. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

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1 Pyic 6C De Broglie Wavelengt Uncertainty Principle

2 De Broglie Wavelengt Bot ligt and atter ave bot particle and wavelike propertie. We can calculate te wavelengt of eiter wit te ae forula: p v For large object (like a baeball) ti wavelengt will be far too all to eaure, but for tiny particle like electron or neutron, we get wavelengt tat are eaily detectable in te lab.

3 Eaple: Electron are accelerated acro a potential difference of 100 Volt. Find te wavelengt of te electron. Te a of an electron i kg. Copare te energy of tee electron to te energy of poton of equal wavelengt.

4 Eaple: Electron are accelerated acro a potential difference of 100 Volt. Find te wavelengt of te electron. Te a of an electron i kg. Copare te energy of tee electron to te energy of poton of equal wavelengt. Firt ting to realize i tat te electron pick up oe kinetic energy a it accelerate acro te potential difference (1 ev of energy for eac volt). KE electron 100eV J

5 Eaple: Electron are accelerated acro a potential difference of 100 Volt. Find te wavelengt of te electron. Te a of an electron i kg. Copare te energy of tee electron to te energy of poton of equal wavelengt. Firt ting to realize i tat te electron pick up oe kinetic energy a it accelerate acro te potential difference (1 ev of energy for eac volt). KE electron 100eV J Fro ti we can find te peed of te electron v J v Wile very fat, ti i not cloe enoug to te peed of ligt to worry about relativity.

6 Eaple: Electron are accelerated acro a potential difference of 100 Volt. Find te wavelengt of te electron. Te a of an electron i kg. Copare te energy of tee electron to te energy of poton of equal wavelengt. Firt ting to realize i tat te electron pick up oe kinetic energy a it accelerate acro te potential difference (1 ev of energy for eac volt). KE electron 100eV J Fro ti we can find te peed of te electron v J v Wile very fat, ti i not cloe enoug to te peed of ligt to worry about relativity. Now we can jut ue te DeBroglie wavelengt forula: J v 31 6 ( kg)( )

7 Eaple: Electron are accelerated acro a potential difference of 100 Volt. Find te wavelengt of te electron. Te a of an electron i kg. Copare te energy of tee electron to te energy of poton of equal wavelengt. Firt ting to realize i tat te electron pick up oe kinetic energy a it accelerate acro te potential difference (1 ev of energy for eac volt). KE electron 100eV J Fro ti we can find te peed of te electron v J v Wile very fat, ti i not cloe enoug to te peed of ligt to worry about relativity. Now we can jut ue te DeBroglie wavelengt forula: J v 31 6 ( kg)( ) E A poton wit ti wavelengt a energy: c 15 ( ev )( ) 10,100eV Copared to te 100eV electron, ti poton a uc ore energy. Ti i one of te reaon wy electron icrocope are ued to get iage of tiny object a poton bea igt daage te object. 15 J

8 Heienberg Uncertainty Principle Baic Idea you can t get eact eaureent 2 Verion: E p t 2 2

9 Eaple: For te electron in te previou eaple, teir wavelengt wa 0.123n. Take ti to be te uncertainty in teir poition, and find te correponding uncertainty in teir peed.

10 Eaple: For te electron in te previou eaple, teir wavelengt wa 0.123n. Take ti to be te uncertainty in teir poition, and find te correponding uncertainty in teir peed. p 2

11 Eaple: For te electron in te previou eaple, teir wavelengt wa 0.123n. Take ti to be te uncertainty in teir poition, and find te correponding uncertainty in teir peed. p ( v 2 ) 2

12 Eaple: For te electron in te previou eaple, teir wavelengt wa 0.123n. Take ti to be te uncertainty in teir poition, and find te correponding uncertainty in teir peed. p ( v 2 ) 2 ( ) ( kg v ) J

13 Eaple: For te electron in te previou eaple, teir wavelengt wa 0.123n. Take ti to be te uncertainty in teir poition, and find te correponding uncertainty in teir peed. p ( v 2 ) 2 ( v ) ( kg v ) J

14 Eaple: For te electron in te previou eaple, teir wavelengt wa 0.123n. Take ti to be te uncertainty in teir poition, and find te correponding uncertainty in teir peed. p ( v 2 ) 2 ( v ) ( kg v ) J Copare ti to te velocity we found in te previou proble. Tat value wa So te uncertainty i alot a uc a te actual velocity!

15 Eaple A certain ato a an energy level 3.50eV above te ground tate. Wen ecited to ti tate, it reain 4.0µ, on average, before eitting a poton and returning to te ground tate. a) Wat i te energy of te poton? Wat i te wavelengt of te poton? b) Wat i te allet poible uncertainty in te energy of te poton?

16 Eaple A certain ato a an energy level 3.50eV above te ground tate. Wen ecited to ti tate, it reain 4.0µ, on average, before eitting a poton and returning to te ground tate. a) Wat i te energy of te poton? Wat i te wavelengt of te poton? b) Wat i te allet poible uncertainty in te energy of te poton? Te poton a energy 3.50 ev. It wavelengt i calculated in te uual way:

17 Eaple A certain ato a an energy level 3.50eV above te ground tate. Wen ecited to ti tate, it reain 4.0µ, on average, before eitting a poton and returning to te ground tate. a) Wat i te energy of te poton? Wat i te wavelengt of te poton? b) Wat i te allet poible uncertainty in te energy of te poton? Te poton a energy 3.50 ev. It wavelengt i calculated in te uual way: E c poton ( ev )( eV 8 ) 355n

18 Eaple A certain ato a an energy level 3.50eV above te ground tate. Wen ecited to ti tate, it reain 4.0µ, on average, before eitting a poton and returning to te ground tate. a) Wat i te energy of te poton? Wat i te wavelengt of te poton? b) Wat i te allet poible uncertainty in te energy of te poton? Te poton a energy 3.50 ev. It wavelengt i calculated in te uual way: E c poton ( ev )( eV 8 ) 355n Ue Heienberg forula to find te iniu uncertainty in te energy:

19 Eaple A certain ato a an energy level 3.50eV above te ground tate. Wen ecited to ti tate, it reain 4.0µ, on average, before eitting a poton and returning to te ground tate. a) Wat i te energy of te poton? Wat i te wavelengt of te poton? b) Wat i te allet poible uncertainty in te energy of te poton? Te poton a energy 3.50 ev. It wavelengt i calculated in te uual way: E c poton ( ev )( eV 8 ) 355n Ue Heienberg forula to find te iniu uncertainty in te energy: E t 2 E (2)( t) E (2)(4 10 ev 6 ) ev Note tat ti i uc aller tan te energy of te poton, o te uncertainty i negligible.

Physics 6C. Heisenberg Uncertainty Principle. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

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