Class 12PhysicsDual Nature of Radiation and MatterEinstein's Photoelectric Equation and Energy Quantum of Radiation
MediumAn electron in a hydrogen atom jumps from the second Bohr orbit to the ground state,and the energy difference of the two states is radiated in the form of photons. These photons are then allowed to fall on a metal surface having a work function equal to $4.2 \ eV$. Calculate the stopping potential. [Energy of electron in $n^{\text{th}}$ orbit $= -\frac{13.6}{n^2} \ eV$] (in $V$)
- A$2$
- B$4$
- C$6$
- D$8$
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Similar Questions
The work function of a substance is $4.0 \,eV$. The longest wavelength of light that can cause photoelectron emission from this substance is approximately ......... $nm$.
Match the temperature of a black body given in List-$I$ with an appropriate statement in List-$II$, and choose the correct option.
[Given: Wien's constant as $2.9 \times 10^{-3} \, m-K$ and $\frac{hc}{e}=1.24 \times 10^{-6} \, V-m$ ]
List-$I$ List-$II$ $(P)$ $2000 \, K$ $(1)$ The radiation at peak wavelength can lead to emission of photoelectrons from a metal of work function $4 \, eV$ $(Q)$ $3000 \, K$ $(2)$ The radiation at peak wavelength is visible to human eye. $(R)$ $5000 \, K$ $(3)$ The radiation at peak emission wavelength will result in the widest central maximum of a single slit diffraction. $(S)$ $10000 \, K$ $(4)$ The power emitted per unit area is $1/16$ of that emitted by a blackbody at temperature $6000 \, K$. $(5)$ The radiation at peak emission wavelength can be used to image human bones.
[Given: Wien's constant as $2.9 \times 10^{-3} \, m-K$ and $\frac{hc}{e}=1.24 \times 10^{-6} \, V-m$ ]
| List-$I$ | List-$II$ |
| $(P)$ $2000 \, K$ | $(1)$ The radiation at peak wavelength can lead to emission of photoelectrons from a metal of work function $4 \, eV$ |
| $(Q)$ $3000 \, K$ | $(2)$ The radiation at peak wavelength is visible to human eye. |
| $(R)$ $5000 \, K$ | $(3)$ The radiation at peak emission wavelength will result in the widest central maximum of a single slit diffraction. |
| $(S)$ $10000 \, K$ | $(4)$ The power emitted per unit area is $1/16$ of that emitted by a blackbody at temperature $6000 \, K$. |
| $(5)$ The radiation at peak emission wavelength can be used to image human bones. |
In an experiment aimed to disprove Einstein's photoelectric equation,how did Millikan prove it?
Difficult
View SolutionThe ratio of work functions of two metals is $1:2$. If light of frequencies $f$ and $2f$ are incident on them respectively,what is the ratio of the maximum kinetic energy of the emitted photoelectrons?
Difficult
View SolutionThe following graphs show the variation of stopping potential $(V_s)$ corresponding to the frequency of incident radiation $(f)$ for a given metal. The correct variation is shown in graph ($f_0 =$ Threshold frequency):
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