Question

Which of the results is more reliable from light intensity point of view?

• A. Mr Y's
• B. Mr Z's
• C. Mr W's
• D. All of (a),(b) & (c)

Answer 1

The correct option is C Mr W's

Cutoff $\lambda$ corresponding to the work functions is given by $\frac{hc}{Workfunction}$

${\lambda }_{1.2eV}=1657.5nm$

${\lambda }_{2.4eV}=828.7nm$

${\lambda }_{3.6eV}=552.5nm$

So 1.2 eV and 2.4 eV will record wavelengths higher that visible range.

So 3.6 eV is more reliable from light intensity point of view.

So, the answer is option (C).