What Wavelength of Light Is Required to Cause the Ejection

question 17

Multiple Choice

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) 485 nm
• B) 390 nm
• C) 308 nm
• D) 632 nm
• E) 480 nm

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