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Standard XII
Physics
Question

If light of wavelength 4000˚A falls on a metal which has a stopping potential 1.4 volt against photoelectric emission then what is the work function of the metal.(Takeh=6.6×10−34Js and c=3×108ms−1)

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Q1
Light of wavelength 4000∘A falls on a photosensitive metal and a negative 2V potential stops the emitted electrons. The work function of the material (in eV) is approximately (h=6.6×10−34Js,e=1.6×10−19 C,c=3×108 ms−1)
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Q2
The work function of Potassium is 2.0eV. When it is illuminated by light of wavelength 3300 Ao, photoelectrons are emitted. The stopping potential of photoelectrons is :

[h=6.6×10−34Js,1eV=1.6×10−19J, Velocity of light,c=3×108ms−1]

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Q3
Light of wavelength 4000∘A falls on a photosensitive metal and a negative 2V potential stops the emitted electrons. The work function of the material (in eV) is approximately (h=6.6×10−34Js,e=1.6×10−19 C,c=3×108 ms−1)
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Q4
In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is 2×10−7 m and stopping potential is 2.5 V. The threshold frequency of the metal is approximately (Change of electron e=1.6×10−19 C, Planck's constant h=6.6×10−34 Js)
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Q5
In a photoelectric experiment the stopping potential for the incident light of wavelength 4000˚A is 2 volt. If the wavelength be changed to 3000˚A, the stopping potential will be :
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