The work function for the following meta...

The work function for the following metals is given Na: 2.75 eV, K:2.30 eV , Mo: 4.17 eV , Ni: 515 eV.
Which of these metals will not give photoelectric emission for a radiation of wavelength 3300 A from a `He-Cd` laser placed 1m away from the photocell? What happens if the laser is brought nearer and placed 50 cm away?

Na only

Na and K only

Na, K & Mo only

in all of them

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