Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |
Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |
(d) Curie temperature
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For continuous X-rays produced wavelength is
|
(a) Inversely proportional to the energy of the electrons hitting the target |
|
(b) Inversely proportional to the intensity of the electron beam |
|
(c) Proportional to intensity of the electron beam |
|
(d) Proportional to target temperature |
Which of the following phenomena suggests the presence of electron energy levels in atoms
|
(a) Radio active decay |
(b) Isotopes |
|
(c) Spectral lines |
(d) a -particles scattering |
In which of the following systems will the radius of the first orbit (n = 1) be minimum
|
(a) Single ionized helium |
(b) Deuterium atom |
|
(c) Hydrogen atom |
(d) Doubly ionized lithium |