MCQ
When an electron jumps from the fourth orbit to the second orbit, one gets the:
- ASecond line of Paschen series.
- BSecond line of Balmer series.
- CFirst line of Pfund series.
- DSecond line of Lyman series.
✓
Answer
- Second line of Balmer series.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A car is moving with at a constant speed of 60kmh-1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh-1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are correct?
When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters
|
(a) 1 : 2 |
(b) 2 : 1 |
(c) 4 : 1 |
(d) 1 : 4 |
Referring to the figure below, the effective resistance of the network is
|
(a) 2 r |
(b) 4 r |
(c) 10 r |
(d) 5r/2 |
Magnetic permeability is maximum for
|
(a) Diamagnetic substance |
(b) Paramagnetic substance |
|
(c) Ferromagnetic substance |
(d) All of these |
Characteristic X-rays are produced due to
|
(a) Transfer of momentum in collision of electrons with target atoms |
|
(b) Transition of electrons from higher to lower electronic orbits in an atom |
|
(c) Heating of the target |
|
(d) Transfer of energy in collision of electrons with atoms in the target |
Order of magnitude of density of uranium nucleus is (
|
(a) |
(b) |
(c) |
(d) |
A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is
|
(a) 15 A |
(b) 50 A |
(c) 25 A |
(d) 12.5 A |
Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in webers is
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) None of these |
Excitation energy of a hydrogen like ion in its excitation state is 40.8 eV. Energy needed to remove the electron from the ion in ground state is:
In the circuit element given here, if the potential at point B, VB = 0, then the potentials of A and D are given as
|
(a) |
(b) |
|
(c) |
(d) |
