Which metal will be suitable for a photoelectric cell using light of wavelength 
? (The work functions of sodium and copper are 2.0 eV and 4.0 eV, respectively.)
Text Solution
Verified by ExpertsThe correct answer is:
A
To eject photoelectrons from sodium, the longest wavelength is 
and that for copper is 
. Hence, for light of wavelength 
, sodium is suitable.
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