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Light is incident of the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is 1.10 × 106 m/s. What is the wavelength of the light?
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- ?Lv 75 days agoFavorite Answer
KE = hc/λ - Φ
½*9.11e-31kg*(1.10e6m/s)² =
6.626e-34kg·m²/s * 3e8m/s / λ - 2.3*1.6e-19J
solves to λ = 2.16e-7 m or 216 nm
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