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Home » Answer the following questions:(a) Why should gases be insulators at ordinary pressures and start conducting at very low pressures?(b) Every metal has a definite work function. Why do all photoelectrons not come out with the same energy if incident radiation is monochromatic? Why is there an energy distribution of photoelectrons?
Answer the following questions:
(a) Why should gases be insulators at ordinary pressures and start conducting at very low pressures?
(b) Every metal has a definite work function. Why do all photoelectrons not come out with the same energy if incident radiation is monochromatic? Why is there an energy distribution of photoelectrons?
CBSE | Class 12 | Dual Nature of Radiation and Matter | NCERT | Physics
Answer the following questions:
(a) Why should gases be insulators at ordinary pressures and start conducting at very low pressures?
(b) Every metal has a definite work function. Why do all photoelectrons not come out with the same energy if incident radiation is monochromatic? Why is there an energy distribution of photoelectrons?

(a) Because of collisions and recombination with other molecules in the gas, the ions in the gas have no chance of reaching their corresponding electrons at atmospheric pressure. Ions have a chance to reach their corresponding electrons at low pressures, resulting in current flow.

(b) The work function is the minimal energy required for an electron in the conduction band to leave the metal. Because these electrons occupy distinct energy levels, they emit electrons with varying energies for the same incident radiation.

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