- AAn atomic electron is ejected.
- BAn electron which is already present within the nucleus is ejected.
- CA neutron in the nucleus decays emitting an electron.
- DA proton in the nucleus decays emitting an electron.
Explanation:
Negative beta decay is given as
$\text{n}\rightarrow\text{p + e}^-+\bar{\text{v}}$
Neutron decays to produce proton, electron and anti-neutrino.
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Assertion : We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals.
Reason : The current through the PN junction is not same in forward and reversed bias.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If assertion is false but reason is true. |
Which one of the following is not electromagnetic in nature
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(a) X-rays |
(b) Gamma rays |
(c) Cathode rays |
(d) Infrared rays |
In Wheatstone's bridge P = 9 ohm, Q = 11 ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge
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(a) 24 ohm |
(b) |
(c) 26.4 ohm |
(d) 18.7 ohm |