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PhysicsModern PhysicsAtomic structureEasy2 minPYQ_2020

PhysicsEasysingle choice

A particular hydrogen like atom has its ground state binding energy $= 122.4 eV .$ It is in ground state. Then,

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Answer:

Solution:

Ground state binding energy $= 13.6 \times z^{2} eV$

$\Rightarrow z = \sqrt{\frac{122.4}{13.6}} = 3$

The first excitation energy

$Δ E = 13.6 \times z^{2} \times (1 - \frac{1}{4}) eV = 91.8 eV$

$K {.E}_{\max} = 125 - 122.4 = 2.6 eV$

Hence, $90 eV$ electron cannot excite it.

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Atomic structure

⏱ 2mℹ️ Source: PYQ_2020

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