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Electromagnetic radiation of wavelength $3000 Å$ is incident on an isolated platinum sphere of work-function $6.30 e V$ . Due to the radiation, the

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sphere becomes positively charged

sphere becomes negatively charged

sphere remains neutral

maximum kinetic energy of the rejected photoelectrons would be $2.03 e V$

answer is C.

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Detailed Solution

$E = \frac{12375}{3000} = 4.125 e V$
Since, $E < W$ no photoelectric effect will be observed.

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