De Broglie wavelength of a tennis ball

AI Thread Summary
The de Broglie wavelength of a moving tennis ball is calculated to be 1x10^-33 meters, indicating that it does not display wave properties. The discussion revolves around understanding why the correct answer to the multiple-choice question is that the tennis ball does not behave as a wave. The calculation involves using the formula for wavelength, which incorporates Planck's constant and momentum, but the mass of the tennis ball is crucial for determining its momentum. Given the typical mass of a tennis ball is around 58 grams, it is established that it does not travel at light speed. Overall, the tennis ball's extremely small de Broglie wavelength confirms its particle-like behavior rather than wave-like properties.
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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What's the momentum?
 
Wavelength= Plank's constant/Momentum
Therefore rearranging the equation
(6.63x10^-34)/(1x10^-33)=0.663
 
... and, the mass of a tennis ball?
 
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.
 
With that mass is it anywhere near light speed?
 
Ahhhh I see! I didn't think of that. Thank you :).
 
Good --- that take care of things for you?
 
Yep. Thanks :D
 

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