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. When an electron and a positron combine together in such a way that both of them disappear and their combined mass reappear as two gamma ray photons. This is called __________. (Photoelectric effect, Annihilation, X-rays production, Compton effect)

Asked by Narendra Kumar Sharma 22/02/2015 Last Modified 22/02/2015

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The emf of a source is equal to the potential difference across the terminals of the source when either its internal resistance is __________. (Zero, Infinite, Zero or infinite, None of these)

When the internal resistance is zero. If otherwise, the voltage across the terminals of the source suffers a loss across the internal resistance of the emf source.

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The SI unit of current is __________. (Ampere, Coulomb, volt, None of these)

Ampere

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__________ of the following is not a fundamental postulate of Bohr’s theory of hydrogen atom. (The total energy of the electron in one of it allowed orbit remains constant as long as it remains in the same orbit, An electron can not revolve in an arbitrary orbit. Only those orbits are possible for which the angular momentum of the electron about the nucleus is an integral multiple of h/2p, The electron can move in all possible orbits, An atom radiates energy only when an electron jumps from an allowed orbit of higher energy En to one of the lower energy Ep)

The electron can move in all possible orbits

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This is due to the following reasons : 1. The basis for determining the Value of this Asset. 2. Absence of any existing accounting standards for the same, 3. The possible tax implications.

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