In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on q for constructive interference at P between the ray BP and reflected ray OP
|
(a) cosq = 3l/2d |
(b) cosq = l/4d |
(c) secq – cosq = l/d |
(d) secq – cosq = 4l/d |
(b) cosq = l/4d
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The mass equivalent of 931 MeV energy is
|
(a) 1.66 |
(b) 6.02 |
(c) 1.66 |
(d) 6.02 |
Boolean algebra is essentially based on
|
(a) Truth |
(b) Logic |
(c) Symbol |
(d) Numbers |
The wavelength of 
X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is
| (a) 20 | (b) 60 | (c) 40 | (d) 80 |
Four charges equal to – Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is
|
(a) |
(b) |
(c) - |
(d) |
