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Sodium has a work function of 2.46 eV (a) Find the cutoff wavelength and cutoff frequency for the photoelectric effect wavele

just need help on part b. Thanks

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6.626 xlo 164 x169 18 16 X1o9 5.1154 eV Stopping fate tst 5-154 ev = 5.1154 VolJ-

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just need help on part b. Thanks Sodium has a work function of 2.46 eV (a)...
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