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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017

The photo electric threshold wave length of silver is $3250 \times 10^{-10}\;m$ . The velocity of the electrons ejected from a silver surface by ultraviolet light of wavelength $2536 \times 10^{-10}\;m$ is : (Given $h=4.14 \times 10^{-10} \;eVs$ and $c= 3 \times 10^{8} \;ms^{-1})$

$\begin{array}{1 1} (1) \approx 6 \times 10^5\;ms^{-1} \\ (2) \approx 0.6 \times 10^6\;ms^{-1} \\ (3) \approx 61 \times 10^3\;ms^{-1} \\ (4) \approx 0.3 \times 10^6\;ms^{-1} \end{array} $

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