In Rutherford scattering experiment, what will be the

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In Rutherford scattering experiment, what will be the correct angle for α-scattering for an impact parameter, b = 0 ?

1. 90°
2. 270°
3. 0°
4. 180°

Correct Option: D

Impact parameter for Rutherford scattering experiment,

b =	Ze² cot(θ/2)	= 0 ⇒ cot(θ/2) = 0
	4π∊₀k_i

⇒	θ	= 90° or θ = 180°
	2