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Standard XII

Chemistry

Reasons of Stability

A photon of e...

Question

A photon of energy $15 e V$ collides with $H -$ atom. Due to this collision, $H -$ atom gets ionized .The maximum kinetic energy of emitted electron is

1.4 e V

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5 e V

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15 e V

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13.6 e V

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Solution

The correct option is A $1.4 e V$
Energy of photon $= 15 e V$
The maximum energy required by hydrogen atom for ionisation $= 13.6 e V$
So, kinetic energy left in electron after ionisation $= (15 - 13.6) e V$ $= 1.4 e V$
[ Assuming photon loses its energy fully to the electron without any losses ]

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A photon of energy 15 eV collides with H−atom. Due to this collision, H−atom gets ionized .The maximum kinetic energy of emitted electron is

The correct option is A 1.4 eVEnergy of photon =15eVThe maximum energy required by hydrogen atom for ionisation =13.6eVSo, kinetic energy left in electron after ionisation =(15−13.6)eV=1.4eV[ Assuming photon loses its energy fully to the electron without any losses ]

A photon of energy $15 e V$ collides with $H -$ atom. Due to this collision, $H -$ atom gets ionized .The maximum kinetic energy of emitted electron is

The correct option is A $1.4 e V$
Energy of photon $= 15 e V$
The maximum energy required by hydrogen atom for ionisation $= 13.6 e V$
So, kinetic energy left in electron after ionisation $= (15 - 13.6) e V$ $= 1.4 e V$
[ Assuming photon loses its energy fully to the electron without any losses ]