The minimum energy required to remove an electron is called
|
(a) Stopping potential |
(b) Kinetic energy |
(c) Work function |
(d) None of these |
(c) Work function
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An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings are A and V respectively. If another resistance R is connected in parallel with the voltmeter
|
(a) Both A and V will increase |
(b) Both A and V will decrease |
|
(c) A will decrease and V will increase |
(d) A will increase and V will decrease |
Three resistances of one ohm each are connected in parallel. Such connection is again connected with 2/3 Ω resistor in series. The resultant resistance will be
|
(a) |
(b) |
(c) 1 Ω |
(d) |
A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in
|
(a) 256 year |
(b) 128 year |
(c) 64 year |
(d) 24 year |
$\frac{\lambda}{4}$
$\frac{\lambda}{3}$
$\frac{\lambda}{2}$
$\lambda.$
A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to be done by an external agency is
|
(a) – 2pE |
(b) – pE |
(c) pE |
(d) 2pE |
