Explanation:
Line respectrum is characteristic of the element because it obtained of atoms only. Continous spectrum is characteristics of the source of light.
In the spectrum of sodium, there are two prominent yellow lines of wavelength 589.0 nm and 589.6 nm.
Absorption line spectrum is not characteristic of the element.
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A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are
|
(a) 1 |
(b) 5 |
(c) 4 |
(d) 3 |
The neutron was discovered by
|
(a) Marie Curie |
(b) Pierre Curie |
(c) James Chadwick |
(d) Rutherford |
The possible quantum number for 3d electron are
|
(a) n = 3, l = 1, |
(b) n = 3, l = 2, |
|
(c) n = 3, l = 1, |
(d) n = 3, l =0, |
In optical instruments, the lenses are used to form images by:
The internal resistance of a cell depends on
|
(a) The distance between the plates |
(b) The area of the plates immersed |
|
(c) The concentration of the electrolyte |
(d) All the above |
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
|
(a) Is zero |
(b) Decreases as |
(c) Increases as r |
(d) Decreases as |
The symbol given in figure represents
|
(a) NPN transistor |
(b) PNP transistor |
|
(c) Forward biased PN junction diode |
(d) Reverse biased NP junction diode |
The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt. What is the self inductance of the coil ?
|
(a) 0.1 H |
(b) 0.2 H |
(c) 0.4 H |
(d) 0.8 H |
