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If work function of a metal is 3 eV and wavelength of subjected radiation to the metal is 275 nm. Then the de Broglie's wavelength (in Å) of photoelectrons emitted by the metal is nearly n. Value of n rounded off to nearest integer, is
(Given hc=1240 eV nm )

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Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 45
The wavelength of photon of energy E is same as the de Broglie wavelength of a material particle moving with the 7.5×107 ms-1 and kinetic energy E'. Then EE' is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 46
A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some times during which a total energy of 1×10-7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron. The potential on sphere will be n∨. Value of n rounded off to integer, is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 47
Photons are incident from vacuum on a transparent material with a refractive index 1.50 for a given wavelength. The momentum of the incident photon, if its wavelength in the material is equal toλ, is hnλ. Value of n, is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 48
Energy from the sun is received on the earth at the rate of 2cal/cm2/min. If average wavelength of solar light be taken at 5500 Å, then photons received on the face of earth facing the sun in 1 hour (approx.), is 1.76×10N. Value of N, is
(1 cal = 4.2 J, Radius of earth =6400 km ).
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 49
An electron of mass m when accelerated through a potential difference V, has a de Broglie wavelength λ. The de Broglie wavelength associated with a proton of mass M accelerated through a potential difference 4 V will be λnmM.
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 50
A beam of light of flux density 30 kW/m2 is incident normally on a 100 mm2 completely absorbing screen. If P is the pressure exerted on the screen, then P=10-n N/m2. Value of n, is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 63
Light of wavelength 2000 Å falls on a metallic surface whose work function is 4.21 eV. Calculate the stopping potential.
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 42
When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. It is possible to cause emission by using