(D) The energy of the incident photon is given by $E = \frac{hc}{\lambda}$.Using $hc = 1240 \, eV \cdot nm$ and $\lambda = 350 \, nm$,we get $E = \fra

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Metal $A$ will not emit photo-electrons

(D) The energy of the incident photon is given by $E = \frac{hc}{\lambda}$.Using $hc = 1240 \, eV \cdot nm$ and $\lambda = 350 \, nm$,we get $E = \frac{1240}{350} \approx 3.54 \, eV$.Photo-electric emission occurs only if the energy of the incident photon is greater than the work function of the metal $(E > \Phi)$.For metal $A$: $\Phi_A = 4.8 \, eV$. Since $3.54 \, eV For metal $B$: $\Phi_B = 2.2 \, eV$. Since $3.54 \, eV > 2.2 \, eV$,metal $B$ will emit photo-electrons.Therefore,metal $A$ will not emit photo-electrons.

Class 12 Physics Dual Nature of Radiation and matter Einstein's Photoelectric Equation and Energy Quantum of Radiation

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If two metals $A$ and $B$ are exposed to radiation of wavelength $350 \, nm$. The work functions of metals $A$ and $B$ are $4.8 \, eV$ and $2.2 \, eV$ respectively. Choose the correct option.

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A
Metal $B$ will not emit photo-electrons
B
Both metals $A$ and $B$ will emit photo-electrons
C
Both metals $A$ and $B$ will not emit photo-electrons
D
Metal $A$ will not emit photo-electrons

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Dual Nature of Radiation and matter

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Einstein's Photoelectric Equation and Energy Quantum of Radiation

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When light of frequencies ${\nu _1}$ and ${\nu _2}$ $({\nu _1} > {\nu _2})$ is incident on a metal surface,the ratio of the maximum kinetic energy of the emitted photoelectrons is $1:k$. What is the threshold frequency of the metal?

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$A$ light of wavelength $310 \,nm$ is used in a photoelectric experiment. The metal electrode of work function $2.5 \,eV$ is used in the experiment. The stopping potential for the photoelectrons will be (assume $hc = 1240 \,eV-nm$): (in $V$)

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An isolated metallic sphere is illuminated by light of $4\,eV$ photon energy. If the work function of the metal is $2\,eV$,then the minimum potential of the sphere so that no photoelectrons are ejected is ................ $V$.

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If two metals $A$ and $B$ are exposed to radiation of wavelength $350 \, nm$. The work functions of metals $A$ and $B$ are $4.8 \, eV$ and $2.2 \, eV$ respectively. Choose the correct option.

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When light of frequencies ${\nu _1}$ and ${\nu _2}$ $({\nu _1} > {\nu _2})$ is incident on a metal surface,the ratio of the maximum kinetic energy of the emitted photoelectrons is $1:k$. What is the threshold frequency of the metal?

Radiation of two photon energies,twice and five times the work function of a metal,are incident successively on the metal surface. The ratio of the maximum velocity of photoelectrons emitted in the two cases is:

$A$ light of wavelength $310 \,nm$ is used in a photoelectric experiment. The metal electrode of work function $2.5 \,eV$ is used in the experiment. The stopping potential for the photoelectrons will be (assume $hc = 1240 \,eV-nm$): (in $V$)

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