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Barium has a work function of 2.5 eV. What it the velocity of an electron emitted...

Barium has a work function of 2.5 eV. What it the velocity of an electron emitted from light with a wavelength of 487 nm?

3.01 x 105 m/s

1.34 x 105 m/s

6.68 x 105 m/s

6.54 x 105 m/s

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