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The work function of aluminium is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be

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Important Questions on Modern Physics

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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 107
When radiation is incident on photoelectron emitter, the stopping potential is found to be 9 V. If e/m for the electron is 1.8×1011Ckg-1, the maximum velocity of the ejected electrons is
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JEE Advanced
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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 108
Two identical metal plates show photoelectric effect by a light of wavelength λA falling on plate A and λB on plate BλA=2λB. The maximum kinetic energy is
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 109
When radiation of wavelength λ is incident on a metallic surface, the stopping potential is 4.8 V. If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes 1.6 V. Then, the threshold wavelength for the surface is
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 110
In a photoemissive cell with executing wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to λ4, the speed of the fastest emitted electron will be
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 111
Photoelectric effect supports quantum nature of light, because
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 112
If the work function of potassium is 2 eV, then its photoelectric threshold wavelength is
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JEE Advanced
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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 113
Threshold wavelength for a metal is 5200 Å. The photoelectron will be ejected, if it is irradiated by light from
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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 114
A photocell is illuminated by a point source of light, which is placed at a distance d from the cell. If the distance becomes d2, then number of electrons emitted per second will