(B) According to Einstein's photoelectric equation,the maximum kinetic energy $(K_{max})$ is given by: $K_{max} = h\nu - \Phi_0$,where $\Phi_0$ is the

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(B) According to Einstein's photoelectric equation,the maximum kinetic energy $(K_{max})$ is given by: $K_{max} = h\nu - \Phi_0$,where $\Phi_0$ is the work function.Since $K_{max} = eV_0$,we can write: $eV_0 = h\nu - \Phi_0$.Dividing by $e$,we get: $V_0 = (\frac{h}{e})\nu - \frac{\Phi_0}{e}$.Comparing this with the equation of a straight line $y = mx + c$,where $y = V_0$ and $x = \nu$,the slope $(m)$ is $\frac{h}{e}$.Multiplying the slope by the charge of the electron $(e)$,we get: $m \times e = (\frac{h}{e}) \times e = h$.Thus,the product gives the Planck's constant $(h)$.

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

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In the case of the photoelectric effect,the graph of measured stopping potential $(V_0)$ against the frequency $(\nu)$ of incident light is a straight line. The slope of this line multiplied by the charge of an electron $(e)$ gives:

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A
the work function of the metal.
B
the Planck's constant.
C
the maximum kinetic energy of the ejected electrons.
D
the threshold frequency for photoejection from the metal.

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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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Light of wavelength $1824 \mathring A$,incident on the surface of a metal,produces photo-electrons with maximum energy $5.3 \ eV$. When light of wavelength $1216 \mathring A$ is used,the maximum energy of photoelectrons is $8.7 \ eV$. The work function of the metal surface is .............. $eV$.

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In the case of the photoelectric effect,the graph of measured stopping potential $(V_0)$ against the frequency $(\nu)$ of incident light is a straight line. The slope of this line multiplied by the charge of an electron $(e)$ gives:

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Light of wavelength $1824 \mathring A$,incident on the surface of a metal,produces photo-electrons with maximum energy $5.3 \ eV$. When light of wavelength $1216 \mathring A$ is used,the maximum energy of photoelectrons is $8.7 \ eV$. The work function of the metal surface is .............. $eV$.

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