Class 12PhysicsDual Nature of Radiation and MatterEinstein's Photoelectric Equation and Energy Quantum of Radiation
MediumGiven below are two statements:
Statement $I$: Stopping potential in photoelectric effect does not depend on the power of the light source.
Statement $II$: For a given metal,the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light.
In the light of the above statements,choose the most appropriate answer from the options given below.
Statement $I$: Stopping potential in photoelectric effect does not depend on the power of the light source.
Statement $II$: For a given metal,the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light.
In the light of the above statements,choose the most appropriate answer from the options given below.
- AStatement $I$ is incorrect but statement $II$ is correct.
- BBoth Statement $I$ and Statement $II$ are incorrect.
- CStatement $I$ is correct but statement $II$ is incorrect.
- DBoth statement $I$ and statement $II$ are correct.
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Similar Questions
Sodium and copper have work functions $2.3 \ eV$ and $4.5 \ eV$ respectively. Then the ratio of their threshold wavelengths is nearest to
Two photons with energies three times and nine times the work function of a metal surface are incident on it. What is the ratio of the maximum velocities of the photoelectrons emitted in the two cases?
Medium
View SolutionMatch 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. |
The work function of a metal surface is $1.6 \times 10^{-19} \text{ J}$. When light of wavelength $6400 \ \mathring{A}$ is incident on this surface,the maximum kinetic energy of the emitted photoelectrons is ....... $\text{J}$.
Difficult
View SolutionElectrons are emitted with kinetic energy $T$ from a metal plate by an irradiation of light of intensity $J$ and frequency $v$. Then, which of the following will be true?
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