Question

The difference between threshold wavelengths for two metal surfaces A and B having work function $Φ_A$= 9 eV and $Φ_B$ = 4.5 eV in nm is:
{Given, hc = 1242 eV nm}

• A. 264
• B. 540
• C. 276
• D. 138

Answer 1

Answer: (D)

138

Answer 2

The correct option is(D): 138