1.

When an o-particle of mass m moving with velocity v bombards on a heavy nucleus of charge 'Ze', its distance of closest approach from the nucleus depends on m as

Answer»

`(1)/(sqrt(m))`
`(1)/(m_(e))`
m
`(1)/(m)`

Solution :Initial KINETIC ENERGY = Distance from CENTRE -Potential energy
`(1)/(2)MV^(2)=(2Ze^(2))/(4pi epsi_(0)r_(0))`
`:.r_(0)=(2Ze^(2))/(4pi epsi_(0)xx(1)/(2)mv^(2))`
`:. In r_(0) prop (Ze^(2))/(pi epsi_(0)v^(2)m),(Ze^(2))/(pi epsi_(0)v^(2))` constant
`:. r_(0) prop (1)/(m)`


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