Advertisements
Advertisements
प्रश्न
Name the factors on which photoelectric emission from a surface depends.
Advertisements
उत्तर
Factors on which photoelectric emission from a surface depends:
- Frequency of light
- Intensity of light
- Photosensitivity of the material
संबंधित प्रश्न
Find the maximum frequency of X-rays produced by 30 kV electrons.
How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's photoelectric equation?
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?
Would you prefer a material with a high melting point or a low melting point to be used as a cathode in a diode?
Why does thermionic emission not take place in non-conductors?
The cathode of a diode valve is replaced by another cathode of double the surface area. Keeping the voltage and temperature conditions the same, will the place current decrease, increase or remain the same?
Define the term "Threshold frequency", in the context of photoelectric emission.
Emission of electrons by the absorption of heat energy is called ____________ emission.
Why do metals have a large number of free electrons?
A 150 W lamp emits light of the mean wavelength of 5500 Å. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second.
