Work function of lithium and copper are respectively 2.3 
and 4.0 
. Which one of the metal will be useful for the photoelectric cell working with visible light? 
Text Solution
Verified by ExpertsThe correct answer is:
A
From 
The maximum wavelength of light required for the photoelectron emission, 
Similarly 
.
Since the wavelength 3094 
does not in the visible region, but it is in the ultraviolet region. Hence to work with visible light, lithium metal will be used for photoelectric cell.
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