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Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Calculate the energy associated in eV with a photon of wavelength `4000A^o`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Mention one physical process for the release of electron from the surface of a

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The maximum kinetic energy of photoelectron is 2.8 eV. What is the value of stopping

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Derive an expression for debroglie wavelength of an

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Light of wavelength `2000A^o` falls on an aluminum surface. In aluminum 4.2 eV are required to remove an electron. What is the kinetic energy of (a) fastest (b) the slowest

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electromagnetic wave of wavelength λ is incident on a photosensitive surface of negligible work function. If the photoelectrons emitted form this surface have de-broglie wavelength `λ_1` . Prove that

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It is difficult to remove a free electron from copper than from sodium?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The following table gives the values of work functions for a few sensitive metals. S. No. Metal Work function(eV) 1 Na 1.92 2 K 2.15 3 Mo 4.17 If each of these metals is exposed to radiations of wavelength 3300nm, which of these will not exit photoelectrons and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Define threshold wavelength for photoelectric effect? Debroglie wavelength associated with an electron associated through a potential difference V isλ ? What will be the new wavelength when the accelerating potential is increase to

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An electron has kinetic energy equal to 100eV. Calculate (1) momentum (2) speed (3) Debroglie wavelength of the

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Calculate the threshold frequency of photon for photoelectric emission from a metal of work function

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Ultraviolet light is incident on two photosensitive materials having work function `φ_1 and φ_2 (φ_1 > φ_2 )`. In which of the case will K.E. of emitted electrons be greater?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Show graphically how the stopping potential for a given photosensitive surface varies with the frequency of incident

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Obtain the expression for the maximum kinetic energy of the electrons emitted from a metal surface in terms of the frequency of the incident radiation and the threshold

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For a given K.E. which of the following has the smallest de–broglie wavelength: electron, proton, α − particle

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Photoelectrons are emitted with a maximum speed of `7×10^5m`/`s` from a surface when light of frequency `8×10^(14)Hz` is incident on it. Find the threshold frequency for this

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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