In Young's double slit experiment, the distance between sources is 1 mm and distance between the screen and source is 1 m. If the fringe width on the screen is 0.06 cm, then λ =
|
(a) 6000 Å |
(b) 4000 Å |
(c) 1200 Å |
(d) 2400 Å |
(a) 6000 Å
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A light wave has a frequency of 4 
Hz and a wavelength of 5
meters in a medium. The refractive index of the medium is
|
(a) 1.5 |
(b) 1.33 |
(c) 1.0 |
(d) 0.66 |
A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will
| (a) Decrease | (b) Remain unchanged | (c) Increase | (d) Stop flowing |
$\frac{1}{2}\text{kx}^2$
$-\frac{1}{2}\text{kx}^2$
$\frac{1}{4}\text{kx}^2$
$-\frac{1}{4}\text{kx}^2$
Two metallic charged spheres whose radii are 20 cm and 10 cm respectively, have each 150 micro - coulomb positive charge. The common potential after they are connected by a conducting wire is
|
(a) 9 × |
(b) 4.5 × |
(c) 1.8 × |
(d) 13.5 × |
The capacity of a parallel plate condenser is 10μF without dielectric. Dielectric of constant 2 is used to fill half the distance between the plates, the new capacitance in μF is
|
(a) 10 |
(b) 20 |
(c) 15 |
(d) 13.33 |
