After five half lives what will be the fraction of initial substance
|
(a) |
(b) |
(c) |
(d) |
After five half lives what will be the fraction of initial substance
|
(a) |
(b) |
(c) |
(d) |
(b) ![]()
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What is the angle between the electric dipole moment and the electric field strength due to it on the equatorial line
|
(a) 0o |
(b) 90o |
(c) 180o |
(d) None of these |
The continuous X-rays spectrum produced by an X-ray machine at constant voltage has
| (a) A maximum wavelength | (b) A minimum wavelength |
|
(c) A single wavelength |
(d) A minimum frequency |
Biaxial crystal among the following is
|
(a) Calcite |
(b) Quartz |
(c) Selenite |
(d) Tourmaline |
An average induced e.m.f. of 1V appears in a coil when the current in it is changed from 10A in one direction to 10 A in opposite direction in 0.5 sec. Self-inductance of the coil is
|
(a) 25 mH |
(b) 50 mH |
(c) 75 mH |
(d) 100 mH |