Explanation:
An electron will absorb energy when jumping from the 1st orbit to the 3rd orbit.
Only by absorbing energy, an electron will be able to jump from the first orbit to the third orbit in the atomic spectrum.
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The shortest wavelength of X-rays emitted from an X-ray tube depends on the
|
(a) Current in the tube |
(b) Voltage applied to the tube |
|
(c) Nature of gas in the tube |
(d) Atomic number of target material |
A nuclear reaction given by 
represents
|
(a) g-decay |
(b) Fusion |
(c) Fission |
(d) b-decay |
Which of the following is not reversible
|
(a) Joule effect |
(b) Peltier effect |
(c) Seebeck effect |
(d) Thomson effect |
The ratio of the energy of an X-ray photon of wavelength 1 Å to that of visible light of wavelength 5000 Å is
| (a) 1: 5000 | (b) 5000 : 1 | (c) 1 :25 × 106 | (d) 25 × 106 |
The unit of mutual conductance of a triode valve is
|
(a) Siemen |
(b) Ohm |
(c) Ohm metre |
(d) Joule Coulomb–1 |
An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like
→Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio
|
(a) 1 : 2 |
(b) 1 : 1 |
(c) 2 : 1 |
(d) 1 : 4 |