The difference between threshold wavelengths for two metal surfaces A and B having work function 
= 9 eV and 
= 4. 5 eV in nm is: {Given, he = 1242 eV nm}
Text Solution
Verified by ExpertsThe correct answer is:
D
The work function is given by
By the given data,
The difference between the wavelengths,
= 138 nm
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