The threshold frequency `v_(0)` for a metal is `6xx10^(14) s^(-1)`. Calculate the kinetic energy of an electron emitted when radiation of frequency `v=1.1xx10^(15) s^(-1)` hits the metal.
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The energy of the electron in the ground state of hydrogen atom is `-13.6 eV`. Find the kinetic energy and potential energy of electron in this state.
Correct Answer - B Kinetic energy of electron in ground state =-(Totoal energy in this state) `" " --(13.6 )eV=13.6 eV`
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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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If a light with frequency `4xx10^(16) Hz` emitted photoelectrons with double the maximum kinetic as are emitted by the light of frequency `2.5xx10^(16
Correct Answer - `1xx10^(16) Hz` For frequency `2.5xx10^(16) Hz, h v=hv_(o)+KE_(max)` `:. h(2.5xx10^(16))=hv_(o)+KE_(max) ...(i)` For frequency `4xx10^(16)` Hz, `h(4xx10^(16))=hv_(o)+2KE_(max) ...(2)` Multiply `eq^(n)` (1) by `2` and substract `eq^(n)` (2) from it....
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When a certain metal was irradiated with light frequency `1.6xx10^(16) Hz`, the photo electrons emitted had twice the kinetic energy as did photoelect
Correct Answer - 4 By photoelectric effect `hv=hv_(0)+KE` `:. KE_(1)=h(v_(1)-v_(0)) …(1)` `KE_(2)=h(v_(2)-v_(0))=KE_(1)//2 …(2)` Dividing equation (2) by (1) we have `(v^(2)-v_(0))/(v_(1)-v_(0))=1/2` `(1.0xx10^(16))/(1.6xx10^(16)-v_(0))=1/2 2.0 xx10^(16)-2v_(0)=1.6xx10^(16)-v_(0)` `v_(0)=4xx10^(15) Hz`
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For silver metal, threshold frequency is `1.1 xx 10^(17) s^(-1)`. What is the maximum kinetic energy of the photoelectrons prodcued by shining ultravi
Correct Answer - A `E_("subjected")=hv_(0)+KE` `thereforeKE = 6.6 xx10^(-34)xx[(3xx10^(8))/(1.5 xx 10^(-9))-1.1xx10^(17)]` `= 5.94 xx10^(-17)J`
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Calculate the kinetic energy of a photoelectron (in eV) emitted on shining light of wavelength `6.2 xx 10^(-6)m` on a metal surface. The work function
Correct Answer - 0.1 eV
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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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Calculate the energy of the hydrogen atom in the states n = 4 and n = 2. Determine the frequency and wavelength of the emitted radiation in a transiti
Correct Answer - `0.85 eV, 3.4 eV, 6.16 xx 10^(14) Hz, 4.87 xx 10^(-7)m`; yes
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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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