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A photocell is used to automatically swi...

A photocell is used to automatically switch on the street lights in the evening when the sunlight is low in intensity. Thus it has to work with visible light. The material of the cathode of the photocell is

A

zinc

B

aluminium

C

nickel

D

potassium

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CHETANA PUBLICATION-Dual Nature of Radiation and Matter-EXERCISE
  1. An electron is accelerated through a potential difference of 100,000 V...

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  2. The wavelength of a particle of mass m and energy EK will be

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  3. A photocell is used to automatically switch on the street lights in th...

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  4. An electron, a proton, α -particle and a hydrogen atom are moving with...

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  5. The de-Broglie wavelength of a particle of kinetic energy Ek is lambda...

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  6. The hypothesis that material particle in motion has dual properties of...

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  7. The rest mass of photon of wavelength lambda is

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  8. If the wave properties of a particle are difficult to observe, it is p...

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  9. Which of the following graph represent the variation of particle mome...

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  10. The wavelength X of de Broglie waves associated withan electronof mass...

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  11. In Davisson and Germer Experiment, maximum intensity is obtained at sc...

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  12. If the accelerating potential in Davisson and Germer’s Experiment is 5...

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  13. An electron is accelerated under a potential difference of 54 V. The s...

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  14. The momentum of a particle associated with de-Broglie is wavelength of...

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  15. Electron beam is accelerated so that de-Broglie wavelength is 10 overs...

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  16. Select and write the correct answer: In photoelectric emission, the nu...

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  17. The mass of moving photon is

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  18. The momentum of electron, if their wavelength is 10overset@A

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  19. In Davisson - Germer experiment, maximum intensity is obtained at

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  20. State the Einstein's equation for the photoelectric emission

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