Explanation:
$\beta$−decay:
$\beta$− radioactivity occurs when a nucleus emits a negative electron from an unstable radioactive nucleus whose deBroglie wavelength of order MeV is much larger than nuclear dimensions.
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The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 mH inductor is
|
(a) 1592 Hz |
(b) 1592 MHz |
(c) 1592 kHz |
(d) 159.2 Hz |
In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be
|
(a) |
(b) |
(c) 4C |
(d) 2C |
A battery of 6 volts is connected to the terminals of a three metre long wire of uniform thickness and resistance of the order of 100 Ω. The difference of potential between two points separated by 50 cm on the wire will be
|
(a) 1 V |
(b) 1.5 V |
(c) 2 V |
(d) 3 V |
Which one of the following nuclear reactions is a source of energy in the sun
|
(a) |
|
(b) |
|
(c) |
|
(d) |
The inductance of a solenoid 0.5 m long of cross-sectional area 20 cm2 and with 500 turns is
|
(a) 12.5 mH |
(b) 1.25 mH |
(c) 15.0 mH |
(d) 0.12 mH |
Two wires A and B of same material and same mass have radius 2rand r. If resistance of wire A is 34 Ω, then resistance of B will be
|
(a) 544 Ω |
(b) 272 Ω |
(c) 68 Ω |
(d) 17 Ω |
