Explanation:
The observed spectral lines are caused by the transition of electrons between two energy levels in an atom.
The emission spectrum of the hydrogen atom is divided into many spectral series, with wavelengths that are given by Rydberg’s formula.
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The clear sky appears blue because:
The angle between the earth's magnetic and the earth's geographical axes is
| (a) Zero | (b) 17° | (c) 23° | (d) None of these |
Circular part in the centre of retina is called
|
(a) Blind spot |
(b) Yellow spot |
(c) Red spot |
(d) None of the above |
A convex lens of crown glass (n =1.525) will behave as a divergent lens if immersed in
|
(a) Water (n = 1.33) |
(b) In a medium of n = 1.525 |
|
(c) Carbon disulphide n = 1.66 |
(d) It cannot act as a divergent lens |
Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in 
at the centre of the coils will be (
|
(a) 5 |
(b) 7 |
(c) 12 |
(d) |
The equivalent resistance and potential difference between A and B for the circuit is respectively
|
(a) 4 W, 8 V |
(b) 8 W, 4 V |
(c) 2 W, 2 V |
(d) 16 W, 8 V |
