Green light ejects photoelectrons from a given photosensitive surface whereas yellow light does not. What will happen in case of |
(i) violet, and |
(ii) red light? |
Give reason for your answer. |
Answer:
As photoelectric emission takes place for green light but does not take place for yellow light. Hence, threshold wavelength \[{{\lambda }_{0}}\] lies somewhere between them.
(i) When incident light is of violet colour, its wavelength is even less than that of green light, i.e. \[\lambda <{{\lambda }_{0}},\] as a result, photoelectric emission will definetly take place. (ii) When incident light is of red colour, its wavelength is even greater than that of yellow light, i.e. \[\lambda >{{\lambda }_{0}},\] consequently, no photoelectric emission will take Place.
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