In Rutherford scattering experiment, the correct angle for scattering of α-particles for impact parameter equal to zero is:
A) 90°
B) 120°
C) 270°
D) 180°

In Rutherford scattering, the angle of scattering for alpha particles depends on the impact parameter, which is the perpendicular distance from the center of the target nucleus to the trajectory of the incoming alpha particle.

When the impact parameter is zero, the alpha particle is directed straight toward the nucleus. In this case, the particle will be deflected by the nucleus, and the angle of scattering will be the maximum possible, as the particle undergoes a direct collision with the target nucleus. The deflection will occur along a straight line back in the opposite direction.

For a situation with an impact parameter equal to zero, the correct angle of scattering will be 180°, which means the alpha particle will scatter directly back along its path.

Thus, the correct answer is:

D. 180°