The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are <math> <mn>2.14</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> <mo>,</mo> <mn>2.30</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> </math> and <math> <mn>2.75</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> </math> respectively. If incident electromagnetic radiation has an incident energy of <math> <mn>2.20</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> </math> , which of these photosensitive surfaces may emit photoelectrons?

Let height of bridge = h <!- [endif]-><!- [endif]->Displacement of ball, S = - h <!- [endif]-><!- [endif]-> S = u t + 1 2 a t 2 - h = 4 × 4 + 1 2 ( - 10 ) ( 4 ) 2 ⇒ h = 64 m <!- [endif]-><!- [endif]->

The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are <math> <mn>2.14</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> <mo>,</mo> <mn>2.30</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> </math> and <math> <mn>2.75</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> </math> respectively. If incident electromagnetic radiation has an incident energy of <math> <mn>2.20</mn> <mi mathvariant="normal">e</mi> <mi mathvariant="normal">V</mi> </math> , which of these photosensitive surfaces may emit photoelectrons? &lt;!-- [if !supportLineBreakNewLine]--&gt; &lt;!--[endif]--&gt;

Na only

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

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Photoelectric Effect Dual Nature of Radiation and Matter Physics Class 12th

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 $N a$ and $K$

Option 4 -

K only

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1 Answer

Answered by

alok kumar singh | Contributor-Level 10

a month ago

Correct Option - 4

Detailed Solution:

Let height of bridge $= h$

Displacement of ball, $S = - h$

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

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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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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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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?