When a proton is accelerated with 1 volt potential difference, then its kinetic energy is
|
(a) |
(b) 1840 eV |
(c) 1 eV |
(d) 1840 c2 eV |
When a proton is accelerated with 1 volt potential difference, then its kinetic energy is
|
(a) |
(b) 1840 eV |
(c) 1 eV |
(d) 1840 c2 eV |
(c) 1 eV
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When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon
|
(a) The time for which light falls on the metal |
|
(b) Frequency of the incident light |
|
(c) Intensity of the incident light |
|
(d) Velocity of the incident light |
X – rays and γ - rays of the same energies may be distinguished by
|
(a) Their velocity |
(b) Their ionising power |
|
(c) Their intensity |
(d) Method of production |
If M is the atomic mass and A is the mass number, packing fraction is given by
|
(a) |
(b) |
(c) |
(d) |
At a place the value of horizontal component of the earth's magnetic field H is 3
. A metallic rod AB of length 2 m placed in east-west direction, having the end A towards east, falls vertically downward with a constant velocity of 50 m/s. Which end of the rod becomes positively charged and what is the value of induced potential difference between the two ends
|
(a) End A, 3 |
(b) End A, 3 mV |
|
(c) End B, 3 |
(d) End B, 3 mV |
Why are red coloured lights are used in traffic signals to stop the vehicles?