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प्रश्न
Define stopping potential.
उत्तर
The minimum negative potential given to the anode of a photo-cell for which the photoelectric current becomes zero is called stopping potential.
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संबंधित प्रश्न
When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is `"V"/4`. The threshold wavelength for the metallic surface is
The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is __________.
What is the photoelectric effect?
How will you define threshold frequency?
Mention the different types of photocells.
Explain the quantum concept of light.
Give the construction and working of photo emissive cell.
Calculate the energies of the photons associated with the following radiation:
- violet light of 413 nm
- X-rays of 0.1 nm
- radio waves of 10 m
When a 6000 Å light falls on the cathode of a photo cell, photoemission takes place. If a potential of 0.8 V is required to stop emission of electron, then determine the
- frequency of the light
- energy of the incident photon
- work function of the cathode material
- threshold frequency and
- net energy of the electron after it leaves the surface.
A 3310 Å photon liberates an electron from a material with energy 3 × 10−19 J while another 5000 Å photon ejects an electron with energy 0.972 × 10−19 J from the same material. Determine the value of Planck’s constant and the threshold wavelength of the material.
