Question:
If the threshold wavelength of a photoelectric material lies in the green light region, then which one of the following light will not emit photoelectrons?
If the threshold wavelength of a photoelectric material lies in the green light region, then which one of the following light will not emit photoelectrons?
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VIBGYOR: Violet (shortest λ), Indigo, Blue, Green, Yellow, Orange, Red (longest λ). Photoemission requires λ ≤ λ\(_0\).
Updated On: Apr 24, 2026
- Ultraviolet
- Blue
- Violet
- Orange
- Indigo
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
The photoelectric effect occurs only if the incident light frequency is greater than the threshold frequency (or wavelength less than the threshold wavelength).
Step 2: Detailed Explanation:
Threshold wavelength, λ0, is in the green region (wavelength approximately 550 nm). For photoemission to occur, the incident wavelength must be less than λ0 (or frequency higher than threshold). Order of visible light by increasing wavelength (ROYGBIV): Violet < Indigo < Blue < Green < Yellow < Orange < Red. Green is the threshold. Colors with wavelength shorter than green (Violet, Indigo, Blue) will cause photoemission. Colors with wavelength longer than green (Yellow, Orange, Red) will not. Among the options, Orange has a longer wavelength than green, so it will not emit photoelectrons.
Step 3: Final Answer:
Orange light will not emit photoelectrons.
The photoelectric effect occurs only if the incident light frequency is greater than the threshold frequency (or wavelength less than the threshold wavelength).
Step 2: Detailed Explanation:
Threshold wavelength, λ0, is in the green region (wavelength approximately 550 nm). For photoemission to occur, the incident wavelength must be less than λ0 (or frequency higher than threshold). Order of visible light by increasing wavelength (ROYGBIV): Violet < Indigo < Blue < Green < Yellow < Orange < Red. Green is the threshold. Colors with wavelength shorter than green (Violet, Indigo, Blue) will cause photoemission. Colors with wavelength longer than green (Yellow, Orange, Red) will not. Among the options, Orange has a longer wavelength than green, so it will not emit photoelectrons.
Step 3: Final Answer:
Orange light will not emit photoelectrons.
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