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PHOTOELECTRIC EMISSION

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Photoelectric work function for a surface is 2.4 eV. Light of wavelength 6.8 xx 10^(-7) m shines on the surface. Find the frequency of incident light and also the threshold frequency. Will there be photoelectric emission or not ?

Assertion : In the process of photoelectric emission , all the emitted photoelectrons have the same kinetic energy. Reason : The photon transfers its whole energy to the electron of the atom in photoelectric effect.

represents a graph of most energetic photoelectrons K_(max) (in eV) and frequency v for a metal used as cathod in photoelectrons experiment. The threshold frequency of light for the photoelectric emission from the metal is

Light strikes a sodium surface, causing photoelectric emission. The stopping potential for the ejected electrons is 5.0 V, and the work function of sodium is 2.2 eV. What is the wavelength of the incident light?

For photoelectric emission from certain metal the cut - off frequency is v . If radiation of frequency 2 v impinges on the metal plate , the maximum possible velocity of the emitted electron will be ( m is the electron mass).

in an experimental set up to study the photoelectric effect a point soure fo light of power 3.2xx10^(-3) W was taken. The source can emit monoenergetic photons of energy 5eV and is located at a distance of 0.8 m from the centre of a stationary metallic sphere of work-function 3.0 eV. The radius of the sphere is r = 8..10^(-3) m. The efficiency of photoelectric emission is one for every 10^6 incident photons. Based on the information given above answer the questions given below. (Assume that the sphere is isolated and photoelectrons are instantly swepts away after the emission). Time after which photoelectric emission stops is

A certain element 'A' undergoes photoelectric emission when bombarded by one photon of indigo light. When the material containing the same element was bombarded by two photons of red light with a total of same energy as that of indigo photon, no electron was emitted. Explain.

In a photoelectric emission, electrons are ejected from metals X and Y by light of frequency f. The potential difference V required to stop the electrons is measured for various frequencies.. If Y has a greater work function than X, which graph illustrates the expected results?