In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes
|
(a) 1/3 times |
(b) 1/9 times |
(c) 3 times |
(d) 9 times |
(a) 1/3 times
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99% of a radioactive element will decay between
|
(a) 6 and 7 half lives |
(b) 7 and 8 half lives |
|
(c) 8 and 9 half lives |
(d) 9 half lives |
If nearly 
coulomb liberate 1 gm equivalent of aluminium, then the amount of aluminium (equivalent weight 9) deposited through electrolysis in 20 minutes by a current of 50 amp will be
|
(a) 0.6 gm |
(b) 0.09 gm |
(c) 5.4 gm |
(d) 10.8 gm |
The amount of charge required to liberate 9 gm of aluminium (atomic weight = 27 and valency = 3) in the process of electrolysis is (Faraday's number = 96500 coulombs/gm equivalent)
|
(a) 321660 coulombs |
(b) 69500 coulombs |
(c) 289500 coulombs |
(d) 96500 coulombs |
Starting with a sample of pure 
of it decays into Zn in 15 min. The corresponding half-life is
| (a) 5 min |
(b) 7  min
|
(c) 10 min |
(d) 15 min |