MCQ
In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change:
- An = 2 to n = 1.
- Bn = 3 to n = 1.
- Cn = 4 to n = 2.
- Dn = 3 to n = 2.
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In a potentiometer circuit there is a cell of e.m.f. 2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is
|
(a) |
(b) |
(c) |
(d) |
The current flowing in a coil of self inductance 0.4 mH is increased by 250 mA in 0.1 sec. The e.m.f. induced will be
|
(a) + 1 V |
(b) – 1 V |
(c) + 1 mV |
(d) – 1 mV |
The relation among u, v and f for a mirror is:
Potential gradient is defined as
|
(a) Fall of potential per unit length of the wire |
|
(b) Fall of potential per unit area of the wire |
|
(b) Fall of potential per unit area of the wire |
|
(d) Potential at any one end of the wire |