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A neutron beam of energy E scatters from atoms on a surface with a spacing d = 0.1nm. The first maximum of intensity in the reflected beam occurs at θ = 30°. What is the kinetic energy E of the beam in

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

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Consider a thin target (10–2m square, 10–3m thickness) of sodium, which produces a photocurrent of 100μA when a light of intensity 100W/m2 (λ = 660nm) falls on it. Find the probability that a photoelectron is produced when a photons strikes a sodium atom. [Take density of Na = 0.97

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

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Consider an electron in front of metallic surface at a distance d (treated as an infinite plane surface). Assume the force of attraction by the plate is given as `1/4q^2/(4piε_0d^2)` Calculate work in taking the charge to an infinite distance from the plate. Taking d = 0.1nm, find the work done in electron volts. [Such a force law is not valid for d <

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

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A student performs an experiment on photoelectric effect, using two materials A and B. A plot of Vstop vs ν is given in Fig. Which material A or B has a higher work

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

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A student performs an experiment on photoelectric effect, using two materials A and B. A plot of Vstop vs ν is given in Fig. Given the electric charge of an electron = 1.6 × 10–19 C, find the value of h obtained from the experiment for both A

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

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A particle A with a mass mA is moving with a velocity v and hits a particle B (mass mB) at rest (one dimensional motion). Find the change in the de Broglic wavelength of the particle A. Treat the collision as

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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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

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

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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

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

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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

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

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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

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

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