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प्रश्न
Name the factors on which photoelectric emission from a surface depends.
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उत्तर
Factors on which photoelectric emission from a surface depends:
- Frequency of light
- Intensity of light
- Photosensitivity of the material
संबंधित प्रश्न
The work function of caesium metal is 2.14 eV. When light of frequency 6 × 1014 Hz is incident on the metal surface, photoemission of electrons occurs. What is the
- maximum kinetic energy of the emitted electrons,
- Stopping potential, and
- maximum speed of the emitted photoelectrons?
The work function of the following metals is given : Na 2.75 ev, K = 2.3 eV, Mo = 4.17 eV and Ni = 5.15 eV. Which of these metals will not cause photoelectric emission for radiation of wavelength 3300 Å from a laser source placed 1 m away from these metals? What happens if the laser source is brought nearer and placed 50 cm away?
Consider Figure for photoemission.
How would you reconcile with momentum conservation? Note light (photons) have momentum in a different direction than the emitted electrons.
What prevents electrons from escaping a metal surface under ordinary conditions?
In the boundary-wall analogy, what is the minimum push needed for a free electron to jump over the wall and come out?
In the mechanism of electron emission, what happens after surface positive ions hold free electrons inside the metal?
Which are the three main ways electrons can be emitted from a metal surface?
Which is an example of thermionic emission?
What is the order of the electric field required for field emission?
What must fall on a metal surface for photoelectric emission to occur?
