Question

Rutherford's scattering experiment fails for very small angle because 1. Gold foil is thin 2. The velocity of α particle is large 3. The impact parameter between the α particle source and the nucleus of target is very large as compared to the size of nucleus

Answer 1

Explanation:

Rutherford's scattering formula fails for very small scattering angles because:

\left(1\right)(1)The full nuclear charge of the target atom is partially screened by it's electron

\left(2\right)(2)there is strong repulsive force between the \alphaαparticles and nucleus of the target.

Answer 2

Rutherford scattering experiment

Explanation:

He took Gold foil and passed Alpha rays through it.

These rays were made to pass through a slit.

Alpha rays are actually positively charged rays consisting of Helium nucleus (He). To notice the scattering of rays, he fitted movable screen made of florescent material around the gold foil.

Observations

A. Some rays passed straight.  

B. Some rays were deflected through small & large angles.  

C. Some rays rebound back.

Conclusion

1. Most of the space in atom is empty.  
2. There is something in center of an atom called Nucleus.  
3. Nucleus is +vely charged.  

So, According To Rutherford ,structure of an atom is similar to solar system.  

Now in above asked question : Rutherford's scattering experiment fails for very small angle because  The impact parameter between the α particle source and the nucleus of target is very large as compared to the size of nucleus