Two coherent sources of intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be
|
(a) I1 + I2 |
(b) |
(c) (I1 + I2)2 |
(d) |
(d) 
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Some radioactive nucleus may emit
|
(a) Only one α,β or γ at a time |
|
(b) All the three α,β and γ one after another |
|
(c) All the three α,β and γ simultaneously |
|
(d) Only α and β simultaneously |
The relation between the linear magnification m, the object distance u and the focal length f is
|
(a) |
(b) |
(c) |
(d) |
A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium, if q is equal to
(a) 
|
(b) 
|
(b)
|
(d) 
|
The radius of hydrogen atom in its ground state is 5.3 
. After collision with an electron it is found to have a radius of 21.2 
. What is the principal quantum number n of the final state of the atom
|
(a) n = 4 |
(b) n = 2 |
(c) n = 16 |
(d) n = 3 |
