The work function of caesium is 2.14 eV.

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Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

The work function of caesium is 2.14 eV. Find the threshold frequency for caesium. (Hint : Planck's constant h = 6.63 x 10^-34 Js)

Options:

2.58 x 10^₁₄ Hz

2.58 x 10-^₁₄ Hz

5.16 x 10^₁₄ Hz

5.16 x 10-^₁₄ Hz

Correct Answer:

5.16 x 10^₁₄ Hz

Explanation:

Use : φ₀= hv₀