The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are $2.14 e V, 2.30 e V$ and $2.75 e V$ respectively. If incident electromagnetic radiation has an incident energy of $2.20 e V$ , which of these photosensitive surfaces may emit photoelectrons?

Option 1 - Na only

Option 2 - Cs only

Option 3 - Both <math> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">a</mi> </math> and <math> <mi mathvariant="normal">K</mi> </math>

Option 4 - K only

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Alok Kumar Singh | Contributor-Level 10

5 months ago

Correct Option - 4

Detailed Solution:

Let height of bridge $= h$

Displacement of ball, $S = - h$

$\begin{array}{r} S = u t + \frac{1}{2} {a t}^{2} \\ - h = 4 * 4 + \frac{1}{2} (- 10) (4)^{2} \\ \Rightarrow h = 64 m \end{array}$

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The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are 2.14 e V , 2.30 e V and 2.75 e V respectively. If incident electromagnetic radiation has an incident energy of 2.20 e V , which of these photosensitive surfaces may emit photoelectrons?

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