20.
A polished metal surface requires 1.75 × 10⁻¹⁹ J to remove electrons via the photoelectric effect. When photons with a wavelength of 237 nm strike the surface, what will be the kinetic energy of the ejected electrons? h = 6.626 × 10⁻³⁴ J⋅s, c = 2.998 × 10⁸ m/s
(A) 1.75 × 10⁻¹⁹ J
(B) 1.01 × 10⁻¹⁸ J
(C) 8.39 × 10⁻¹⁹ J
(D) 6.64 × 10⁻¹⁹ J
(E) none of the above
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