KVPY SB SX Exam 2011 Question Paper

Question : 36 of 120

Marks: +1, -0

Given below are three schematic graphs of potential energy V(r) versus distance r for three atomic particles: electron

(e^{-})

proton

(p^{+})

and neutron (n). in the presence of a nucleus at the origin O. The radius o f the nucleus is

r_0

. The scale on the V-axis may not be the same for all figures. The correct pairing of each graph with the corresponding atomic particle is

$(1,n),(2,p^{+})(3,e^{-})$
$(1,p^{+}),(2,e^{-})(3,n)$
$(1,e^{-}),(2,p^{+})(3,n)$
$(1,p^{+}),(2,n)(3,e^{-})$

Validate

Solution:

outside the nucleus electric potential decreases

e^{–}

is negativity charged
∴ its PE is negative even outside the nucleus where nuclear attractive force is negligible

(3) → e^{–}

outside the nucleus neutron will not experience electric force as it is neutral. So no potential energy associated with it outside nucleus.
1 → neutron

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