In hydrogen atom, the electron makes 6.6 
revolutions per second around the nucleus in an orbit of radius 0.5 
. It is equivalent to a current nearly
|
(a) 1 A |
(b) 1 mA |
(c) 1 μA |
(d) 1.6 |
(b) 1 mA
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The energy consumed in 1 kilowatt electric heater in 30 seconds will be
|
(a) 6 |
(b) 4.99 |
(c) 9.8 |
(d) 3 |
The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times
|
(a) |
(b) 4 |
(c) 2 |
(d) 8 |
The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
|
(a) 49o to the horizontal |
(b) 90o with the vertical |
|
(c) 49o to the vertical |
(d) Along the horizontal |
