De Broglie wavelength of a tennis ball

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  • #1
Davidmb19
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This is a multiple choice question.
The de Broglie wavelength of a moving tennis ball is calculated as 1x10^-33. This means that the moving tennis ball
A)Diffracts through a narrow slit.
B)Does not behave as a particle
C)Does not display wave properties
D)Is traveling at the speed of light

The answer is C and I know this through the process of elimination however, I do not conceptually understand why it is. Can someone please explain?
 

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  • #2
Bystander
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What's the momentum?
 
  • #3
Davidmb19
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Wavelength= Plank's constant/Momentum
Therefore rearranging the equation
(6.63x10^-34)/(1x10^-33)=0.663
 
  • #4
Bystander
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... and, the mass of a tennis ball?
 
  • #5
Davidmb19
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lol We don't know the mass. This is a multiple choice but the mass of a tennis ball, in general, is about 58 grams.
 
  • #6
Bystander
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With that mass is it anywhere near light speed?
 
  • #7
Davidmb19
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Ahhhh I see! I didn't think of that. Thank you :).
 
  • #8
Bystander
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Good --- that take care of things for you?
 
  • #9
Davidmb19
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Yep. Thanks :D
 

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