Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius 
and 
respectively. The ratio of mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
(c) 
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Thermionic emission from a heated filament varies with its temperature T as
|
(a) |
(b) T |
(c) |
(d) |
If intensity of incident light is increased in PEE then which of the following is true
|
(a) Maximum K.E. of ejected electron will increase |
|
(b) Work function will remain unchanged |
|
(c) Stopping potential will decrease |
|
(d) Maximum K.E. of ejected electron will decrease |
Lux is equal to
|
(a) 1 lumen/m2 |
(b) 1 lumen/cm2 |
(c) 1 candela/m2 |
(d) 1 candela/cm2 |
To demonstrate the phenomenon of interference, we require two sources which emit radiation
|
(a) Of the same frequency and having a define phase relationship |
|
(b) Of nearly the same frequency |
|
(c) Of the same frequency |
|
(d) Of different wavelengths |
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later
|
(a) 1.0 micro curies |
(b) 0.5 micro curies |
(c) 4 micro curies |
(d) 8 micro curies |
