Einstein s Photo Electric Equation and Energy Quantity Of Radiation (KE, Vmax, Work Function)
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Dual nature of radiation and Matter

142226 When $1 \mathrm{~cm}$ thick surface is illuminated with light of wavelength $\lambda$, the stopping potential is $V$. When the same surface is illuminated by light of wavelength $2 \lambda$, the stopping potential is $\frac{V}{3}$. Threshold wavelength for metallic surface is

1 $\frac{4 \lambda}{3}$
2 $4 \lambda$
3 $6 \lambda$
4 $\frac{8 \lambda}{3}$
JCECE-2014
Dual nature of radiation and Matter

142227 For an LED to emit light in visible region of the electromagnetic spectrum, it can have energy band gap in the range of,
(Planck's constant, $h=6.6 \times 10^{-34} \mathrm{Js}$ and speed of light, $\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}$ in vacuum)

1 $0.1 \mathrm{eV}$ to $0.4 \mathrm{eV}$
2 $0.9 \mathrm{eV}$ to $1.6 \mathrm{eV}$
3 $1.7 \mathrm{eV}$ to $3.1 \mathrm{eV}$
4 $0.5 \mathrm{eV}$ to $0.8 \mathrm{eV}$
AP EAMCET (21.04.2019) Shift-I
Dual nature of radiation and Matter

142228 The stopping potential for photoelectric emission from a metal surface is plotted along $Y$-axis and frequency $v$ of incident light along $\mathrm{X}$-axis. A straight line is obtained as shown. Planck's constant is given by

1 slope of the line
2 product of slope of the line and charge on the electron
3 intercept along $\mathrm{Y}$-axis divided by charge on the electron
4 Product of intercept along $\mathrm{X}$-axis and mass of the electron
Manipal UGET-2018
Dual nature of radiation and Matter

142229 Light quanta with an energy $4.9 \mathrm{eV}$ eject photoelectron from metal with work function 4.5 $\mathrm{eV}$. The maximum momentum of the ejected electron is

1 $3.41 \times 10^{-25} \mathrm{kgms}^{-1}$
2 $5.0 \times 10^{-12} \mathrm{kgms}^{-1}$
3 $2.8 \times 10^{-20} \mathrm{kgms}^{-}$
4 $1.5 \times 10^{-15} \mathrm{kgms}^{-1}$
Assam CEE-2018
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Dual nature of radiation and Matter

142226 When $1 \mathrm{~cm}$ thick surface is illuminated with light of wavelength $\lambda$, the stopping potential is $V$. When the same surface is illuminated by light of wavelength $2 \lambda$, the stopping potential is $\frac{V}{3}$. Threshold wavelength for metallic surface is

1 $\frac{4 \lambda}{3}$
2 $4 \lambda$
3 $6 \lambda$
4 $\frac{8 \lambda}{3}$
JCECE-2014
Dual nature of radiation and Matter

142227 For an LED to emit light in visible region of the electromagnetic spectrum, it can have energy band gap in the range of,
(Planck's constant, $h=6.6 \times 10^{-34} \mathrm{Js}$ and speed of light, $\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}$ in vacuum)

1 $0.1 \mathrm{eV}$ to $0.4 \mathrm{eV}$
2 $0.9 \mathrm{eV}$ to $1.6 \mathrm{eV}$
3 $1.7 \mathrm{eV}$ to $3.1 \mathrm{eV}$
4 $0.5 \mathrm{eV}$ to $0.8 \mathrm{eV}$
AP EAMCET (21.04.2019) Shift-I
Dual nature of radiation and Matter

142228 The stopping potential for photoelectric emission from a metal surface is plotted along $Y$-axis and frequency $v$ of incident light along $\mathrm{X}$-axis. A straight line is obtained as shown. Planck's constant is given by

1 slope of the line
2 product of slope of the line and charge on the electron
3 intercept along $\mathrm{Y}$-axis divided by charge on the electron
4 Product of intercept along $\mathrm{X}$-axis and mass of the electron
Manipal UGET-2018
Dual nature of radiation and Matter

142229 Light quanta with an energy $4.9 \mathrm{eV}$ eject photoelectron from metal with work function 4.5 $\mathrm{eV}$. The maximum momentum of the ejected electron is

1 $3.41 \times 10^{-25} \mathrm{kgms}^{-1}$
2 $5.0 \times 10^{-12} \mathrm{kgms}^{-1}$
3 $2.8 \times 10^{-20} \mathrm{kgms}^{-}$
4 $1.5 \times 10^{-15} \mathrm{kgms}^{-1}$
Assam CEE-2018
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Dual nature of radiation and Matter

142226 When $1 \mathrm{~cm}$ thick surface is illuminated with light of wavelength $\lambda$, the stopping potential is $V$. When the same surface is illuminated by light of wavelength $2 \lambda$, the stopping potential is $\frac{V}{3}$. Threshold wavelength for metallic surface is

1 $\frac{4 \lambda}{3}$
2 $4 \lambda$
3 $6 \lambda$
4 $\frac{8 \lambda}{3}$
JCECE-2014
Dual nature of radiation and Matter

142227 For an LED to emit light in visible region of the electromagnetic spectrum, it can have energy band gap in the range of,
(Planck's constant, $h=6.6 \times 10^{-34} \mathrm{Js}$ and speed of light, $\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}$ in vacuum)

1 $0.1 \mathrm{eV}$ to $0.4 \mathrm{eV}$
2 $0.9 \mathrm{eV}$ to $1.6 \mathrm{eV}$
3 $1.7 \mathrm{eV}$ to $3.1 \mathrm{eV}$
4 $0.5 \mathrm{eV}$ to $0.8 \mathrm{eV}$
AP EAMCET (21.04.2019) Shift-I
Dual nature of radiation and Matter

142228 The stopping potential for photoelectric emission from a metal surface is plotted along $Y$-axis and frequency $v$ of incident light along $\mathrm{X}$-axis. A straight line is obtained as shown. Planck's constant is given by

1 slope of the line
2 product of slope of the line and charge on the electron
3 intercept along $\mathrm{Y}$-axis divided by charge on the electron
4 Product of intercept along $\mathrm{X}$-axis and mass of the electron
Manipal UGET-2018
Dual nature of radiation and Matter

142229 Light quanta with an energy $4.9 \mathrm{eV}$ eject photoelectron from metal with work function 4.5 $\mathrm{eV}$. The maximum momentum of the ejected electron is

1 $3.41 \times 10^{-25} \mathrm{kgms}^{-1}$
2 $5.0 \times 10^{-12} \mathrm{kgms}^{-1}$
3 $2.8 \times 10^{-20} \mathrm{kgms}^{-}$
4 $1.5 \times 10^{-15} \mathrm{kgms}^{-1}$
Assam CEE-2018
For More Updates join with Us
Dual nature of radiation and Matter

142226 When $1 \mathrm{~cm}$ thick surface is illuminated with light of wavelength $\lambda$, the stopping potential is $V$. When the same surface is illuminated by light of wavelength $2 \lambda$, the stopping potential is $\frac{V}{3}$. Threshold wavelength for metallic surface is

1 $\frac{4 \lambda}{3}$
2 $4 \lambda$
3 $6 \lambda$
4 $\frac{8 \lambda}{3}$
JCECE-2014
Dual nature of radiation and Matter

142227 For an LED to emit light in visible region of the electromagnetic spectrum, it can have energy band gap in the range of,
(Planck's constant, $h=6.6 \times 10^{-34} \mathrm{Js}$ and speed of light, $\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}$ in vacuum)

1 $0.1 \mathrm{eV}$ to $0.4 \mathrm{eV}$
2 $0.9 \mathrm{eV}$ to $1.6 \mathrm{eV}$
3 $1.7 \mathrm{eV}$ to $3.1 \mathrm{eV}$
4 $0.5 \mathrm{eV}$ to $0.8 \mathrm{eV}$
AP EAMCET (21.04.2019) Shift-I
Dual nature of radiation and Matter

142228 The stopping potential for photoelectric emission from a metal surface is plotted along $Y$-axis and frequency $v$ of incident light along $\mathrm{X}$-axis. A straight line is obtained as shown. Planck's constant is given by

1 slope of the line
2 product of slope of the line and charge on the electron
3 intercept along $\mathrm{Y}$-axis divided by charge on the electron
4 Product of intercept along $\mathrm{X}$-axis and mass of the electron
Manipal UGET-2018
Dual nature of radiation and Matter

142229 Light quanta with an energy $4.9 \mathrm{eV}$ eject photoelectron from metal with work function 4.5 $\mathrm{eV}$. The maximum momentum of the ejected electron is

1 $3.41 \times 10^{-25} \mathrm{kgms}^{-1}$
2 $5.0 \times 10^{-12} \mathrm{kgms}^{-1}$
3 $2.8 \times 10^{-20} \mathrm{kgms}^{-}$
4 $1.5 \times 10^{-15} \mathrm{kgms}^{-1}$
Assam CEE-2018