Medium
Statement $(I)$ : By increasing the potential difference between cathode and anode continuously in a photoelectric experiment,the photocurrent always increases continuously.
Statement $(II)$ : If two photons $A$ and $B$ of energies $2.5 \ eV$ and $3.5 \ eV$ respectively fall on a metal surface of work function $2.0 \ eV$,then the ratio of maximum kinetic energies emitted between $A$ and $B$ is $3$.
Statement $(III)$ : The maximum energy needed by an electron to come out from metal surface is called the work function of the metal.
Which of the following is correct?
Statement $(II)$ : If two photons $A$ and $B$ of energies $2.5 \ eV$ and $3.5 \ eV$ respectively fall on a metal surface of work function $2.0 \ eV$,then the ratio of maximum kinetic energies emitted between $A$ and $B$ is $3$.
Statement $(III)$ : The maximum energy needed by an electron to come out from metal surface is called the work function of the metal.
Which of the following is correct?
- AStatements $I, II$ and $III$ are true
- BStatements $I, II$ are true,but statement $III$ is false
- CStatements $II, III$ are true,but statement $I$ is false
- DStatements $I, II$ and $III$ are false
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Similar Questions
Some laws/processes are given in Column $I$. Match these with the physical phenomena given in Column $II$.
Column $I$ Column $II$ $(A)$ Transition between two atomic energy levels $(p)$ Characteristic $X$-rays $(B)$ Electron emission from a material $(q)$ Photoelectric effect $(C)$ Mosley's law $(r)$ Hydrogen spectrum $(D)$ Change of photon energy into kinetic energy of electrons $(s)$ $\beta$-decay
| Column $I$ | Column $II$ |
| $(A)$ Transition between two atomic energy levels | $(p)$ Characteristic $X$-rays |
| $(B)$ Electron emission from a material | $(q)$ Photoelectric effect |
| $(C)$ Mosley's law | $(r)$ Hydrogen spectrum |
| $(D)$ Change of photon energy into kinetic energy of electrons | $(s)$ $\beta$-decay |
The de Broglie wavelength of a particle moving with a speed of $0.8 c$ is equal to the wavelength of a photon. If $c$ is the speed of light in vacuum, the ratio of the energy of the photon to the kinetic energy of the particle is:
Match List $I$ with List $II$:
List $I$ List $II$ $A$. Planck's constant $(h)$ $I$. $[M^1 L^2 T^{-2}]$ $B$. Stopping potential $(V_s)$ $II$. $[M^1 L^1 T^{-1}]$ $C$. Work function $(\phi)$ $III$. $[M^1 L^2 T^{-1}]$ $D$. Momentum $(p)$ $IV$. $[M^1 L^2 T^{-3} A^{-1}]$
| List $I$ | List $II$ |
|---|---|
| $A$. Planck's constant $(h)$ | $I$. $[M^1 L^2 T^{-2}]$ |
| $B$. Stopping potential $(V_s)$ | $II$. $[M^1 L^1 T^{-1}]$ |
| $C$. Work function $(\phi)$ | $III$. $[M^1 L^2 T^{-1}]$ |
| $D$. Momentum $(p)$ | $IV$. $[M^1 L^2 T^{-3} A^{-1}]$ |
Which of the following effects support the quantum nature of $EM$ radiation? $(1)$ Photoelectric effect $(2)$ Compton effect $(3)$ Doppler effect $(4)$ Field effect
Medium
View SolutionAssertion $(A)$: Photoelectric effect demonstrates the wave nature of light.
Reason $(R)$: The number of photoelectrons is directly proportional to the frequency of light.
Reason $(R)$: The number of photoelectrons is directly proportional to the frequency of light.
Medium
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