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When monochromatic light of wavelength `lambda` illuminates a metal surfrce, then stopping potential for photo electric current is `3V_(0)`. If wavelength changes to `2lambda` then stopping potential becomes `V_(0)` Threshold wavelength for photo electric emission is:

A

` 4 lamda `

B

`8 lamda `

C

`4//3 `

D

`6 lamda `

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The correct Answer is:
A
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MOTION-PHOTOELECTRIC EFFECT -EXERCISE-1 (OBJECTIVE QUESTIONS)
  1. Light of wavelength 3320 Å incidents on metal surface (work fun...

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  2. Using light of wavelength 6000 Å stopping potential is obtained ...

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  3. When light source is placed at 1 m distant from photo electric...

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  4. In the given diagram if V represent the stopping potential and...

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  5. Photoelectric current as a function of voltage V for different ...

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  6. In the following figure the curves have been drawn between the...

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  7. When monochromatic light of wavelength lambda illuminates a metal surf...

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  8. If the wavelength of incident light decrease from lamda 1 ...

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  9. The retarding potential for having zero photo - electron current

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  10. In photoelectric effect work function of any metal is 2.5 eV. ...

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  11. When ultraviolet light of wavelength 100 nm is incident upon silver pl...

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  12. Slope of V(0) vs v curve is (where V(0)= Stopping potential, v=subject...

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  13. Figure represents the graph of photo current I versus applied ...

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  14. The graph between the energy of photoelectrons E and the wav...

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  15. In the diagram, graph are drawn between stopping potential ...

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  16. For a photoelectric cell, the graph shown the variation of c...

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  17. A monochromatic source of light operation at 200 W emits 4xx10^(20) ph...

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  18. Light of wavelength 5000 Å falls on a sensitive surface. If th...

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  19. In photoelectric equation hv = hv 0 + (1 )/(2) mv ^ 2 of Ei...

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  20. the photoelectric effect can not be explained by the wave theory of li...

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