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Emission and Absorption Spectra

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when the surface of the metal is irradiated by applying the radiation of wavelength 400A, the ejected electron travels with KE\:two third of the incident energy. find the stopping potential of the photoelectron ejected

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Q. Electrons in a hydrogen-like atom

(Z = 3)

make transitions from fourth excites state to third excited state and from third to second excited state. The resulting radiations are incident on a metal plate to eject photoelectrons. The stopping potential for photoelectrons ejected by the shorter wavelength is

3.95 V

. The stopping potential for the photoelectrons ejected by the longer wavelength is

Q. The kinetic energy of the photoelectrons ejected from the metal surface

A

K

when required radiation is incident. If the same radiation is capable of ejecting the electrons from the metal

B

with higher work function, then the kinetic energy of the photoelectrons -

Q. It has been found that, when the surface of metal is irradiated with radiation of suitable frequency, electrons (photo electrons) are ejected from the surface of metal. Minimum energy required for ejection of electron from metal surface is called work function of metal.

A metallic surface is irradiated alternatively with radiations of wavelength 3000

A^{\circ}

A^{\circ}

. It is observed that the maximum speeds of the photoelectrons under these cases are in the ratio 3:1.
Work function of the metallic surface is?

Q. Passage:
It has been found that, when the surface of metal is irradiated with radiation of suitable frequency, electrons (photo electrons) are ejected from the surface of metal. Minimum energy required for ejection of electron from metal surface is called work function of metal.
A metallic surface is irradiated alternatively with radiations of wavelengths

300 A^{\circ}

6000 A^{\circ}

. It is observed that the maximum speeds of the photoelectrons under these cases are in the ratio

3 : 1

.
Work function of the metallic surface is?

Q. Electrons in hydrogen-like atoms

(Z = 3)

make transitions from the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiations are incident normally on a metal plate and eject photoelectrons. The stopping potential for the photoelectrons ejected by the shorter wavelength is 3.95 volts. Calculate the work function of the metal, and the stopping potential(in V) for the photoelectrons ejected by the longer wavelength.

(Rydberg constant = 1.094 \times 10^{7} m^{- 1})

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