# Tennis ball diffraction angles

1. Dec 6, 2007

### natugnaro

1. The problem statement, all variables and given/known data
Quantum effects are negligible in "macroscopic" world.
Show than on example.
A tennis ball with speed 0.5 m/s is thrown thru a window.
Dimensions of a window are 1*1.5 m.
Calculate vertical and horizontal diffraction angles.

2. Relevant equations
$$\lambda$$=h/p
dSin$$\alpha$$=n$$\lambda$$

3. The attempt at a solution
For horizontal diffraction angle.
$$\lambda$$=h/mv=h/m*0.5

I assumed that n=1.
so

dSin$$\alpha$$=n$$\lambda$$=h/m*0.5

$$\alpha$$=ArcSin(h/m*0.5*d)=ArcSin(h/m*0.5*1)

from this I would conclude thath, alpha is negligible small, that is
quantum effect are negligible.
I would do the same thing for vertical angle.
I' not shure if I'm right ?

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted