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  4. The threshold wavelength for photoelectric emission from a material is 4800 mathringA . Photoelectrons will be emitted from the material, when it is illuminated with light from a

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Q. The threshold wavelength for photoelectric emission from a material is $ 4800\mathring{A}$ . Photoelectrons will be emitted from the material, when it is illuminated with light from a

KEAMKEAM 2008Dual Nature of Radiation and Matter

Solution:

The wavelength of blue light is $ 4800 \mathring{A}$ so material will emit photoelectrons when it is illuminated with light from a $ 40 \,W $ blue lamp.