The work function of the following metal is given : Na → 2.75 ev, K → 2.3 eV, Mo → 4.17 eV and NI → 5.15 eV. which of these metals will not cause photoelectric emission for radiation of wavelength 3000 Å from a laser source placed 1 m away from these metals ? What happens if the laser source is bought nearer and placed 50 cm away ?
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