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Which radiations will be most effective for the emission of electrons from a metallic surface?
  • a)
    Microwaves
  • b)
    X rays
  • c)
    Ultraviolet
  • d)
    Infrared
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which radiations will be most effective for the emission of electrons ...
Ultraviolet rays are most effective for photoelectric emission because they have the highest frequency when compared to the other electromagnetic waves, and hence the most energetic among all of them.
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Community Answer
Which radiations will be most effective for the emission of electrons ...


Ultraviolet radiation is the most effective for the emission of electrons from a metallic surface



Explanation:



Photoelectric Effect:

- The emission of electrons from a metallic surface when exposed to electromagnetic radiation is known as the photoelectric effect.

- The energy required to eject an electron from the metal is provided by the incident radiation.



Frequency and Energy:

- The photoelectric effect depends on the frequency of the incident radiation.

- Ultraviolet radiation has higher frequencies and energies compared to microwaves, infrared, and visible light.



Threshold Frequency:

- Metals have a threshold frequency, below which no electrons are emitted.

- Ultraviolet radiation has frequencies higher than the threshold frequency of most metals, making it the most effective for ejecting electrons.



Photon Energy:

- The energy of a photon is directly proportional to its frequency.

- Ultraviolet radiation photons have sufficient energy to overcome the work function of the metal, resulting in the emission of electrons.



Conclusion:

- In conclusion, ultraviolet radiation is the most effective for the emission of electrons from a metallic surface due to its high frequency and energy levels.
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Which radiations will be most effective for the emission of electrons from a metallic surface?a)Microwavesb)X raysc)Ultravioletd)InfraredCorrect answer is option 'C'. Can you explain this answer?
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