A narrow beam of white light goes through a slab having parallel faces.
Explanation:
White light will split into different colours inside the glass slab because the value of refractive index is different for different wavelengths of light; thus, they suffer different deviations. But the emergent light will be white light. As the faces of the glass slide are parallel, the emerging lights of different wavelengths will reunite after refraction.
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The stopping potential as a function of the frequency of the incident radiation is plotted for two different photoelectric surfaces A and B. The graphs show that work function of A is
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(a) Greater than that of B |
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(b) Smaller than that of B |
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(c) Equal to that of B |
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(d) No inference can be drawn about their work functions from the given graphs |
Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is
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(a) |
(b) |
(c) |
(d) |
Resistance of a voltameter is 2Ω, it is connected in series to a battery of 10 V through a resistance of 3Ω. In a certain time mass deposited on cathode is 1 gm. Now the voltameter and the 3Ω resistance are connected in parallel with the battery. Increase in the deposited mass on cathode in the same time will be
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(a) 0 |
(b) 1.5 gm |
(c) 2.5 gm |
(d) 2 gm |
The minimum wavelength of photon is 5000 Å, its energy will be
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(a) 2.5 eV |
(b) 50 V |
(c) 5.48 eV |
(d) 7.48 eV |
The ultimate individual unit of magnetism in any magnet is called
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(a) North pole |
(b) South pole |
(c) Dipole |
(d) Quadrupole |
The electric intensity E, current density j and specific resistance k are related to each other by the relation
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(a) E = j/k |
(b) E = jk |
(c) E = k/j |
(d) k = jE |
