The photoelectric threshold wavelength for tungsten is `2400 Å`. Determine the energy of the electrons ejected from its surface when exposed to ultraviolet radiations of wavelength `1200 Å`.
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The threshold frequency for the ejection of electrons from potassium metal is `5.3xx10^(14) s^(-1)`. Will the photon of a radiation having energy `3.3
Correct Answer - No Work function `W=hv_(0)=6.626xx10^(-34)xx5.3xx10^(14)=3.5xx10^(-19)J` As `W gt` Energy of photon, photoelectric effect will not be exhibited.
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The threshold wavelength `(lambda_(0))` of sodium metal is `6500 Å`. If UV light of wavelength `360 Å` is used, what will be kinetic energy of the pho
Correct Answer - 3 The threshold frequency `(v_(0))` corresponding to the wavelength `6500 Å` is `c//lambda_(0)` Therefore, the threshold energy `=hv_(0)hc//lambda_(0)` Substituting for `h, c` and `lambda_(0)` we gwt threshold energy...
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Light of wavelength `lambda` strikes a metal surface with intensity `X` and the metal emits `Y` electrons per second of average energy `Z`. What will
Correct Answer - 1 Number of emitted electron `prop` Intensity of incident light.
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When photons of wavelength `lambda_(1) = 2920 Å` strike the surface of metal A, the ejected photoelectron have maximum kinetic energy of `k_(1) eV` an
Correct Answer - (a) `phi_(A) = 2.25 eV, phi_(B) = 4.2 eV` (b) `2e V`
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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
Correct Answer - `v =4.41 xx 10^(14)Hz,v_(0)=5.82 xx 10^(14) Hz`, no photoelectric emission occurs as `v lt v_(0)`
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The photoelectric threshold wavelength for lithium is `8000 Å`. Find the maximum kinetic energy in eV of the emitted electrons from the surface by lig
Correct Answer - 0.5156 eV
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The energy of photoelectrons emitted from a sensitive plate is 1.56 eV. If its threshold old wavelength is `2500 Å`, calculate the wavelength of incid
Correct Answer - `1379 Å`
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In a photodiode the coductivity increases when the material is exposed to light. It is found that coductivity change only if the wavelength is less th
Correct Answer - `1.995eV`
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The wavelength of `K_(alpha)` X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell ofa tungsten atom. What should
Correct Answer - [69.5 KV]
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The energy of K-electron in tungsten is -20.0 keV and of an L-electron is -2.0 ke V. Find the wavelength of X-rays emitted when an electron jumps from
Correct Answer - 0.6875 Å
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