(B) The condition for photoelectric emission is that the energy of the incident photon $(E)$ must be greater than or equal to the work function $(\Phi

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(B) The condition for photoelectric emission is that the energy of the incident photon $(E)$ must be greater than or equal to the work function $(\Phi_0)$ of the metal surface.Given incident energy $E = 2.20\,eV$.Work functions are:For $Cs$: $\Phi_0 = 2.14\,eV$For $K$: $\Phi_0 = 2.30\,eV$For $Na$: $\Phi_0 = 2.75\,eV$Comparing $E$ with $\Phi_0$:For $Cs$: $2.20\,eV > 2.14\,eV$ (Emission occurs)For $K$: $2.20\,eV For $Na$: $2.20\,eV Therefore, only $Cs$ will emit photoelectrons.

Class 12 Physics Dual Nature of Radiation and matter Photoelectric Effect by Lenard and it's Observations

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

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A
$Na$ only
B
$Cs$ only
C
Both $Na$ and $K$
D
$K$ only

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Dual Nature of Radiation and matter

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Photoelectric Effect by Lenard and it's Observations

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

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During a photoelectric effect experiment,which of the following physical quantities depends on the intensity of the incident radiation?

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$A$ photocell is illuminated by a small source of light placed at a distance of $1 \ m$. When the same source of light is placed at a distance of $1/2 \ m$,the number of electrons emitted by the photocathode will .......

Which figure shows the correct variation of applied potential difference $(V)$ with photoelectric current $(I)$ at two different intensities of light $(I_1 < I_2)$ of the same wavelength?

The curves $(1)$,$(2)$,$(3)$,and $(4)$ show the variation between the applied potential difference $(V)$ and the photoelectric current $(i)$ at two different intensities of light $(I_1 > I_2)$. In which figure is the correct variation shown?

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