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प्रश्न
If the mean wavelength of light from sun is taken as 550 nm and its mean power as 3.8 × 1026 W, then the average number of photons received by the human eye per second from sunlight is of the order of
विकल्प
1045
1042
1054
1051
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उत्तर
1045
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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 __________.
Give the definition of intensity of light according to quantum concept and its unit.
How will you define threshold frequency?
What is a photocell?
Define stopping potential.
Explain the effect of potential difference on photoelectric current.
Give the construction and working of photo emissive cell.
Give the applications photocell.
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.
