Question:medium
The work function of three photosensitive materials are: Sodium (2.75 eV), copper (4.65 eV) and gold (5.1 eV). Which of the following statements is correct (Visible light range: $4 \times 10^{14}$ Hz to $8 \times 10^{14}$ Hz)?
The work function of three photosensitive materials are: Sodium (2.75 eV), copper (4.65 eV) and gold (5.1 eV). Which of the following statements is correct (Visible light range: $4 \times 10^{14}$ Hz to $8 \times 10^{14}$ Hz)?
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Higher work function ⇒ higher required frequency.
Updated On: May 1, 2026
- Copper and gold
- Sodium
- All with IR
- All with visible
- None
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The Correct Option is B
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