- ASpiral.
- BCircular.
- CParabolic.
- DStraight line.
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An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
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(a) 13.6 eV |
(b) 6.53 eV |
(c) 5.4 eV |
(d) 1.51 eV |
When a negative charge is taken at a height from earth's surface, then its potential energy
|
(a) Decreases |
(b) Increases |
|
(c) Remains unchanged |
(d) Will become infinity |
64 drops of mercury each charged to a potential of 10V. They are combined to form one bigger drop. The potential of this drop will be (Assume all the drops to be spherical)
|
(a) 160 V |
(b) 80 V |
(c) 10 V |
(d) 640 V |
A magnifying glass is used to read the newspaper. As it is moved far away from the newspaper:
To observe diffraction the size of an obstacle
|
(a) Should be of the same order as wavelength |
(b) Should be much larger than the wavelength |
|
(c) Have no relation to wavelength |
(d) Should be exactly |
A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will
|
(a) Decrease and change sign |
|
(b) Increase and change sign |
|
(c) Decrease and remain of the same sign |
|
(d) Increase and remain of the same sign |