KVPY SX SB Exam 2016 Question Paper

Question : 32 of 120

Marks: +1, -0

An electron with kinetic energy E collides with a hydrogen atom in the ground state. The collision will be elastic

Solution:

When

e^{–}

collide with atom which is massive in comparison to

e^{–}

. Max possible loss of KE = KE of

e^{–}

(initial KE) = E
if this E is less than min excitation energy then collision is elastic
∴ E < 10.2 eV (Minimum excitation energy)

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