Question

# A tiny positively charged particle is moving head-on towards a heavy nucleus. The distance of closest approach depends upon,

A
The number of protons in the nucleus.
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B
The number of nucleons in the nucleus.
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C
The mass of the incident particle.
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D
The charge and velocity of the incident particle.
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Solution

## The correct options are A The number of protons in the nucleus. C The mass of the incident particle. D The charge and velocity of the incident particle.The distance of closest approach is given by, $$r_0 = \frac{1}{2 \pi \epsilon_0qZe}{mv^2}$$ q, m and v are charge, mass and velocity of incident particle and Z is the atomic number of the target nucleus.

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