In I experiment , electromagnetic radiat...

In I experiment , electromagnetic radiations of a certain frequency are irradiated on a metal surface ejecting photoelectrons having a certain value of maximum kinetic energy . However, in II experiment on doubling the frequency of incident electromagnetic radiations the maximum kinetic energy of ejected photoelectrons becomes three times. What percentage of incident energy is converted into maximum kinetic energy of photoelectrons in II experiment ?

`75%`

`50%`

`12.5%`

`25%`

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