In the Rutherford experiment,for a head-on co | vedclass

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(B) The impact parameter $b$ is defined as the perpendicular distance of the initial velocity vector of the $\alpha$-particle from the center of the n

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zero

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(B) The impact parameter $b$ is defined as the perpendicular distance of the initial velocity vector of the $\alpha$-particle from the center of the nucleus.For a head-on collision,the $\alpha$-particle travels directly towards the center of the nucleus and retraces its path after the collision.In this case,the perpendicular distance between the path of the $\alpha$-particle and the center of the nucleus is zero.Therefore,the impact parameter for a head-on collision is $0$.

In the Rutherford experiment,for a head-on collision of $\alpha$-particles with a gold nucleus,the impact parameter is:

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