Explanation:
The angular momentum of $\alpha$ particles is conserved because there is no external torque.
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An electron jumps from the 4th orbit to the 2nd orbit of hydrogen atom. Given the Rydberg's constant 
. The frequency in Hz of the emitted radiation will be
|
(a) |
(b) |
(c) |
(d) |
In X-ray spectrum wavelength 
of line 
depends on atomic number Z as
|
(a) |
(b) |
(c) |
(d) |
Two identical parallel plate capacitors are connected in series to a battery of 100 V. A dielectric slab of dielectric constant 4.0 is inserted between the plates of second capacitor. The potential difference across the capacitors will now be respectively
|
(a) 50 V, 50 V |
(b) 80 V, 20 V |
(c) 20 V, 80 V |
(d) 75 V, 25 V |
Which of the following spectral series in hydrogen atom give spectral line of 4860 Å
|
(a) Lyman |
(b) Balmer |
(c) Paschen |
(d) Brackett |
The turn ratio of a transformers is given as 2 : 3. If the current through the primary coil is 3 A, thus calculate the current through load resistance
|
(a) 1 A |
(b) 4.5 A |
(c) 2 A |
(d) 1. 5 A |
Earth's magnetic field always has a horizontal component except at or Horizontal component of earth's magnetic field remains zero at
| (a) Equator | (b) Magnetic poles | (c) A latitude of 60o | (d) An altitude of 60o |
To obtain a P-type germanium semiconductor, it must be doped with
|
(a) Arsenic |
(b) Antimony |
(c) Indium |
(d) Phosphorus |
