Given that a photon of light of wavelength 10,000Å has an energy equal to 1.23eV. When light of wavelength 5000Å and intensity `I_(0)` falls on a photoelectric cell and the saturation current is `0.40xx10^(-6)` ampere and the stopping potential is 1.36 volt, then (i)what is the work function? (ii) If intensity of light is made `4I_(0)`, what should be the saturation current and stopping potential?
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A phot of energy `h upsilon` is absorbed by a free electron of a metal having work function `phi lt h upsilon`
Correct Answer - D Photoelectric effect is a eandom phenomena. So, electron It may come out with a kinetic energy less than `(hv-w)` as some energy is lost while escaping out.
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A photo sensitive surface is receiving light of wavelength `5000Å` at the rate of `10^(-7)J//s`. The number of photons received per second is : (Given
Correct Answer - B `E=n(hc)/(lambda)` `10^(-7)= (nxx(6.626 xx 10^(-34)Js)(3xx 10^(8) m//s))/(5000xx10^(-10)m)` ` n = 2.5 xx 10^(11)` photons per second
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(a) The rest mass energy of an electron is `m_(0)c^(2)=0.51MeV`. Can a photon of this energy create an electron in free space? (A) A single photon of
Correct Answer - (a) No (b) `m_(0)=(h^(2)v^(2))/(2c^(2)[hv-2m_(0)c^(2)])`
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The wavelength of a photon is `1.4 Å`. It collides with an electron. Its wavelength after collision is `2.0 Å`. Calculate the energy of the scattered
Correct Answer - `4.26 xx 10^(-16) J`
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The first excitation potential of sodium atom is 2.1 V. Calculate the longest wavelength of the emitted photon. Will the photon be visible ? To Which
Correct Answer - 5893 Å
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A hydrogen atom in ground state absorbs a photon of ultraviolet radiation of wavelength `50 nm` Assuming that the entire photon energy is taken up by
Correct Answer - `[11.2eV]`
2 Answers 1 views
Whenever a photon is emitted by hydrogen in balmer series it is followed by another in lyman series what wavelength does this latter photon correspond
Correct Answer - `[1224 Å]`
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An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is `5 xx 10^(-4)` phot. Th
Correct Answer - 40 cd
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(a) `[Ti(H_(2)O)_(6)]^(3+)` absorbs light of wavelength 5000Å. Name one ligand which would form a titanium (III) complex absorbing light to lower wave
Correct Answer - (a) `CN^(-),F^(-)` (b) (i) 0 (ii)0 (iii)0 (iv)0
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