The work functions for tungsten and sodium are 4.5 \( \mathrm{eV} \) and \( 2.3 \mathrm{eV} \), ....

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The work functions for tungsten and sodium are 4.5
\( \mathrm{P} \)
\( \mathrm{eV} \) and \( 2.3 \mathrm{eV} \), respectively. If the threshold
W
wavelength \( \lambda \) for sodium is \( 5460 \AA \), the value of \( \lambda \) for tungsten is
(1) \( 5893 \AA \)
(2) \( 10683 \AA \)
(3) \( 2791 \AA \)
(4) \( 528 \AA \)


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