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Explain 'stopping potential' and 'thresh...

Explain 'stopping potential' and 'threshold frequency' in photoelectric emission.Give an appropriate graph.

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Cut off potential or Stopping potential :
Stopping potential : The value of minimum negative potential applied to a plate at which photoelectric current becomes zero is known as stopping potential.
Threshold Frequency : A minimum frequency, below which there is no photoelectric emission, is known as threshold frequency.
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Photoelectric effect When light of sufficiently small wavelength is incident on a metal cathode, it may emit electsons called photoelectrons. This is called photoelectric effect. Above threshold frequency, the stopping potential and hence the energy of the photoelectrons is directly proportional to the frequency. In the given figure, we see the variation of stopping potential with the frquency of incident radiation for three metals A, B and C Which metal has the largest threshold wavelength?

Photoelectric effect When light of sufficiently small wavelength is incident on a metal cathode, it may emit electsons called photoelectrons. This is called photoelectric effect. Above threshold frequency, the stopping potential and hence the energy of the photoelectrons is directly proportional to the frequency. In the given figure, we see the variation of stopping potential with the frquency of incident radiation for three metals A, B and C Which of these metals A, B or C are suitable for photoelectric cell?

BETTER CHOICE PUBLICATION-PARTICLE NATURE OF RADIATION-SHORT ANSWER TYPE QUESTIONS
  1. Why the photoelectric cell is also called an elecric eye?

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  2. Why are alkali metals most suited as photosensitive materials?

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  3. Explain 'stopping potential' and 'threshold frequency' in photoelectri...

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  4. Are matter waves electromagnetic?

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  5. What is the rest mass of a photon?

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  6. What is photo electric cells? Give its two applications.

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  7. It is harder to remove free electrons from copper than from sodium. Wh...

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  8. Blue light can eject electrons from a Photo-sensitive surface, while ...

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  9. Derive Einstein's' photoelectric equation in terms of frequency.

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  10. State the four laws of photoelectric emission.

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  11. What are Photons? Give its two properties.

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  12. Green light ejects electrons from a certain photosensitive surface, ye...

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  13. Write Einsteins's photoelectric equation.

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  14. What is phtotelecric effect?Explain the effect of increase of intensi...

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  15. Define photoeletjric effect ,work function,stopping potential and thre...

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  16. What are Photons? Give its two properties.

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  17. Derive Einstein's' photoelectric equation in terms of frequency.

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  18. What is photoelectric effect? State it laws?

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  19. What is photoelectric cell? Explain any one of the photoelectric cells...

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  20. What is photoelectric cell?How dies it work ?Give its practical uses.

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