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Define distance of closest approach?...

Define distance of closest approach?

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The minimum distance upto which an energetic `alpha`-particle travelling directly towards a nucleus can move before coming to rest and then retracing its path is known as distance of closest approach.
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What is the distance of closest approach when a 5.0 MeV proton approaches a gold nucleus?

A beam of specific kind of particles of velocity 2.1 xx 10^7 m//s is scattered by a gold (Z = 79) nuclei. Find out specific charge (charge/mass) of this particle if the distance of closest approach is 2.5 xx 10^-14 m .

Knowledge Check

  • The distance of closest approach of 1,00 MeV protons incident on gold (Z=79) nuclei will be:

    A
    `1.14 xx 10 ^(-15) m`
    B
    `6.28 xx 10 ^(-15) m`
    C
    `1.44 xx 10 ^(-15) m`
    D
    `8.99 xx 10 ^(-15) m `

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