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The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6eV fall on it is 4eV. The stopping potential in volts is  
 

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Important Questions on Dual Nature of Matter and Radiation

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 6
Light of two different frequencies whose photons have energies of 1eV and 2.5eV are incident one by one on a metal surface of work function 0.5eV. The ratio of maximum energies of emitted electrons will be
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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 7
The work functions of tungsten and sodium are 5.06eV and 2.53eV respectively. If the threshold wavelength for sodium is 5896A°, then the threshold wavelength for the tungsten will be
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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 8
The stopping potential, necessary to reduce the photoelectric current to zero,
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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 9

Graph is plotted between maximum kinetic energy Ek of electron with frequency of incident photon (v) in Photo electric effect. The slope of curve will be-

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 10
The maximum energy of electrons released in a photocell is independent of
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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 11
Photoelectric effect takes place in element A. Its work function is 2.5 eV and threshold wavelength is λ. Another element B has work function of 5 eV. Then, find out the wavelength that can produce photoelectric effect in B.
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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 12
When a certain metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential for photoelectric current is 6V0. When the same surface is illuminated with light of wavelength 2λ, the stopping potential is 2V0. The threshold wavelength of this surface for photoelectric effect is 
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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 13
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m