- Ade – Broglie theory
- BNewton’s theory
- CEinstein’s theory
- DPlanck’s theory
Explanation:
Davisson and Germer experiment proves the concept of wave nature of matter particles. The Davisson–Germer experiment provides a critically important confirmation of the de-Broglie hypothesis, which said that particles, such as electrons, are of dual nature.
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A radioactive substance emits
|
(a) Electromagnetic radiation |
(b) Electrons revolving around the nucleus |
|
(c) Charged particles |
(d) a,c |
If the radioactive decay constant of radium is 1.07
per year, then its half life period is approximately equal to
|
(a) 8,900 years |
(b) 7,000 years |
(c) 6,476 years |
(d) 2,520 years |
Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |
The grid in a triode valve is used
|
(a) To increases the thermionic emission |
|
(b) To control the plate to cathode current |
|
(c) To reduce the inter-electrode capacity |
|
(d) To keep cathode at constant potential |
In Young’s double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelength l. In another experiment with the same set up the two slits are of equal amplitude A and wavelength l but are incoherent. The ratio of the intensity of light at the mid-point of the screen in the first case to that in the second case is
|
(a) 1 : 2 |
(b) 2 : 1 |
(c) 4 : 1 |
(d) 1 : 1 |
An astronomical refractive telescope has an objective of focal length 20m and an eyepiece of focal length 2cm.
The path executed by a charged particle whose motion is perpendicular to magnetic field i
|
(a) A straight line |
(b) An ellipse |
(c) A circle |
(d) A helix |
A magnet is dropped down an infinitely long vertical copper tube
|
(a) The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity |
|
(b) The magnet moves with continuously decreasing velocity and ultimately comes to rest |
|
(c) The magnet moves with continuously increasing velocity but constant acceleration |
|
(d) The magnet moves with continuously increasing velocity and acceleration |