C) barium (-43 x 10-19 J) 40. What wavelength of light is required to cause the ejection of photoelectrons with kinetic energies of 5.0 x 10-20 J from a calcium surface (D = 4.60 x 10-19 J)? A) 390 nm D) 480 nm B) 632 nm E) 485 nm C) 308 nm

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Chapter7: Quantum Theory Of The Atom
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C) barium (= 43 × 10 ¹J)
40. What wavelength of light is required to cause the ejection of photoelectrons with kinetic energies of 5.0 ×
10-20 J from a calcium surface (= 4.60 × 10-19 J)?
A) 390 nm
D)
480 nm
B) 632 nm
E)
485 nm
C) 308 nm
Transcribed Image Text:C) barium (= 43 × 10 ¹J) 40. What wavelength of light is required to cause the ejection of photoelectrons with kinetic energies of 5.0 × 10-20 J from a calcium surface (= 4.60 × 10-19 J)? A) 390 nm D) 480 nm B) 632 nm E) 485 nm C) 308 nm
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