- AAtomic mass
- BMolecular mass
- CAtomic number
- DNone of the above
Explanation:
The mass of an atom expressed in amu is known as atomic mass. atomic mass unit defined as a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12.
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Energy of the electron in nth orbit of hydrogen atom is given by
. The amount of energy needed to transfer electron from first orbit to third orbit is
|
(a) 13.6 eV |
(b) 3.4 eV |
(c) 12.09 eV |
(d) 1.51 eV |
In the given reaction
Radioactive radiations are emitted in the sequence
|
(a) α, β,γ |
(b) β ,α, γ |
(c) γ ,α, β |
(d) β , γ ,α |
The relative permeability is represented by mr and the susceptibility is denoted by c for a magnetic substance. Then for a paramagnetic substance
|
(a) mr < 1, c < 0 |
(b) mr < 1, c > 0 |
(c) mr > 1, c < 0 |
(d) mr > 1, c > 0 |
At the time of total solar eclipse, the spectrum of solar radiation would be
|
(a) A large number of dark Fraunhofer lines |
|
(b) A less number of dark Fraunhofer lines |
|
(c) No lines at all |
|
(d) All Fraunhofer lines changed into brilliant colours |
Electromagnetic radiation of highest frequency is
|
(a) Infrared radiations |
(b) Visible radiation |
(c) Radio waves |
(d) g-rays |