- AOnly white and black fringes will be obtained
- BWhite fringes will be obtained
- ✓Central fringe will be white but two-three colored fringes will appear black
- DNone of the above.
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If the binding energy of the deutrium is 2.23 MeV. The mass defect given in a.m.u. is
|
(a) – 0.0024 |
(b) – 0.0012 |
(c) 0.0012 |
(d) 0.0024 |
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

|
(a) Greater than that of B |
|
(b) Smaller than that of B |
|
(c) Equal to that of B |
|
(d) No inference can be drawn about their work functions from the given graphs |

Two opposite and equal charges 4 × when placed 2
cm away, form a dipole. If this dipole is placed in an external electric field 4
, the value of maximum torque and the work done in rotating it through 180° will be
|
(a) 64 |
(b) 32 |
|
(c) 64 |
(d) 32 |
Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is
|
(a) Zero |
(b) Along the diagonal AC |
|
(c) Along the diagonal BD |
(d) Perpendicular to side AB |