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A metal of work function 4eV is exposed ...

A metal of work function 4eV is exposed to a radiation of wavelength `140xx10^(-9)` m. Find the stopping potential developed by it.

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`E=(hc)/(lamda)`
`E=(6.62xx10^(-34)xx3xx10^(8))/(140xx10^(-9)xx1.6xx10^(-19))eV=8.86eV`
work function `W_(0)=4eV`
`eV_(0)=E-W_(0)=8.86-4=4.86V`
`:.` Stopping potential `V_(0)=4.86V`
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AAKASH SERIES-DUAL NATURE OF RADIATION AND MATTER-PRACTICE EXERCISEX
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  9. Light of wavelength 4000A^(@) is incident on a potassium surface whose...

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  10. Monochromatic light incident on a metal surface emits electron with K....

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  11. Three metals have work functions in the ratio 2 3:4. Graphs are drawn ...

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  13. The work function of a substance is 4eV. The longest wavelength of lig...

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  14. The photo electric work function of a metal is 1 eV. Light of wave len...

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  15. When a mono chromatic point source of light is at a distance of 0.2m f...

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  16. The work function of a substance is 12.4 eV. The longest wavelength of...

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  17. A surface irradiated with light of wave length 480 nm gives out electr...

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  18. The photoelectric threshold wavelength for a certain metal is 4000A^(@...

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  19. What P.D. must be applied to stop the fastest photo electron emitted b...

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  20. The threshold frequency for photo electric effect for a metal surface ...

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  21. The work functions of metals A and B are in the ratio 1 : 2. If light ...

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