The work function for Al, K and Pt is 4.

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Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

The work function for Al, K and Pt is 4.28 eV, 2.30 eV and 5.65 eV respectively. Their respectively threshold frequencies would be:

Options:

Pt > Al > K

Al > Pt > K

K > Al > Pt

Al > K > Pt

Correct Answer:

Pt > Al > K

Explanation:

Work function, $\phi_0=hv_0$

Where $v_0$ = Threshold frequency

So, $\phi_0∝v_0$

Hence Pt > Al > K