Photons of Energy 4

question 1

Multiple Choice

Photons of energy 4.20 eV bombard a surface, which emits photoelectrons with kinetic energies from 0 to 1.80 eV. What is the threshold frequency for this surface?

• A) 1.35 × 10¹⁴ Hz
• B) 5.80 × 10¹⁴ Hz
• C) 1.35 × 10¹⁵ Hz
• D) 7.74 × 10¹⁴ Hz
• E) 7.74 × 10¹⁵ Hz

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