Photoelectric EffectHard
Question
An a particle with a kinetic energy of 2.1 eV makes a head on collision with a hydrogen in ground state atom moving towards it with a kinetic energy of 8.4 eV. The collision.
Options
A.must be perfectly elastic
B.may be perfectly inelastic
C.may be perfectly inelastic
D.must be perfectly inelastic
Solution
The maximum kinetic energy available for transition to potential energy/excitation energy is :
. (vrel)2
=
.(vα + vH)2 = 
.(vα2 + vH2 + 2vαvH)
=
= 
= 10.5 eV > 10.2 eV
Hence, inelastic collision is possible.
. (vrel)2=
.(vα + vH)2 = .(vα2 + vH2 + 2vαvH)=
= = 10.5 eV > 10.2 eV
Hence, inelastic collision is possible.
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