142031 Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes :

142032 The surface of a metal is illuminated with the light of $400 \mathrm{~nm}$. The kinetic energy of the ejected photoelectrons was found to be $1.68 \mathrm{eV}$. The work function of the metal is (hc $=1240 \mathrm{eV} . \mathrm{nm}$ )

142034 When a certain metallic surface is illuminated with monochromatic light of wavelength ' $\lambda$ ', the stopping potential for photoelectric current is ' $2 V_{0}$ '. When the surface is illuminated with light of wavelength ' $3 \lambda$ ', the stopping potential is ' $V_{0} / 2$ '. The threshold wavelength of this surface for photoelectric effect is

142037 The maximum kinetic energy of a photoelectron liberated from the surface of lithium with work function $2.35 \mathrm{eV}$ by electromagnetic radiation whose electric component varies with time as:
$\mathbf{E}=\alpha\left[1+\cos \left(2 \pi f_{1} \mathrm{t}\right)\right] \cos 2 \pi f_{2} \mathrm{t}$ (where $\alpha$ is a constant) is $\left(f_{1}=3.6 \times 10^{15} \mathrm{~Hz}\right.$, and $f_{2}=1.2 \times$ $10^{15} \mathrm{~Hz}$ and Planck's constant $\mathrm{h}=6.6 \times 10^{-34}$ Js)

142031 Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes :

142032 The surface of a metal is illuminated with the light of $400 \mathrm{~nm}$. The kinetic energy of the ejected photoelectrons was found to be $1.68 \mathrm{eV}$. The work function of the metal is (hc $=1240 \mathrm{eV} . \mathrm{nm}$ )

142034 When a certain metallic surface is illuminated with monochromatic light of wavelength ' $\lambda$ ', the stopping potential for photoelectric current is ' $2 V_{0}$ '. When the surface is illuminated with light of wavelength ' $3 \lambda$ ', the stopping potential is ' $V_{0} / 2$ '. The threshold wavelength of this surface for photoelectric effect is

142037 The maximum kinetic energy of a photoelectron liberated from the surface of lithium with work function $2.35 \mathrm{eV}$ by electromagnetic radiation whose electric component varies with time as:
$\mathbf{E}=\alpha\left[1+\cos \left(2 \pi f_{1} \mathrm{t}\right)\right] \cos 2 \pi f_{2} \mathrm{t}$ (where $\alpha$ is a constant) is $\left(f_{1}=3.6 \times 10^{15} \mathrm{~Hz}\right.$, and $f_{2}=1.2 \times$ $10^{15} \mathrm{~Hz}$ and Planck's constant $\mathrm{h}=6.6 \times 10^{-34}$ Js)

142031 Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes :

142032 The surface of a metal is illuminated with the light of $400 \mathrm{~nm}$. The kinetic energy of the ejected photoelectrons was found to be $1.68 \mathrm{eV}$. The work function of the metal is (hc $=1240 \mathrm{eV} . \mathrm{nm}$ )

142034 When a certain metallic surface is illuminated with monochromatic light of wavelength ' $\lambda$ ', the stopping potential for photoelectric current is ' $2 V_{0}$ '. When the surface is illuminated with light of wavelength ' $3 \lambda$ ', the stopping potential is ' $V_{0} / 2$ '. The threshold wavelength of this surface for photoelectric effect is

142037 The maximum kinetic energy of a photoelectron liberated from the surface of lithium with work function $2.35 \mathrm{eV}$ by electromagnetic radiation whose electric component varies with time as:
$\mathbf{E}=\alpha\left[1+\cos \left(2 \pi f_{1} \mathrm{t}\right)\right] \cos 2 \pi f_{2} \mathrm{t}$ (where $\alpha$ is a constant) is $\left(f_{1}=3.6 \times 10^{15} \mathrm{~Hz}\right.$, and $f_{2}=1.2 \times$ $10^{15} \mathrm{~Hz}$ and Planck's constant $\mathrm{h}=6.6 \times 10^{-34}$ Js)

142031 Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes :

142032 The surface of a metal is illuminated with the light of $400 \mathrm{~nm}$. The kinetic energy of the ejected photoelectrons was found to be $1.68 \mathrm{eV}$. The work function of the metal is (hc $=1240 \mathrm{eV} . \mathrm{nm}$ )

142034 When a certain metallic surface is illuminated with monochromatic light of wavelength ' $\lambda$ ', the stopping potential for photoelectric current is ' $2 V_{0}$ '. When the surface is illuminated with light of wavelength ' $3 \lambda$ ', the stopping potential is ' $V_{0} / 2$ '. The threshold wavelength of this surface for photoelectric effect is

142037 The maximum kinetic energy of a photoelectron liberated from the surface of lithium with work function $2.35 \mathrm{eV}$ by electromagnetic radiation whose electric component varies with time as:
$\mathbf{E}=\alpha\left[1+\cos \left(2 \pi f_{1} \mathrm{t}\right)\right] \cos 2 \pi f_{2} \mathrm{t}$ (where $\alpha$ is a constant) is $\left(f_{1}=3.6 \times 10^{15} \mathrm{~Hz}\right.$, and $f_{2}=1.2 \times$ $10^{15} \mathrm{~Hz}$ and Planck's constant $\mathrm{h}=6.6 \times 10^{-34}$ Js)