- 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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Refractive index of air is 1.0003. The correct thickness of air column which will have one more wavelength of yellow light (6000 Å) than in the same thickness in vacuum is
|
(a) 2 mm |
(b) 2 cm |
(c) 2 m |
(d) 2 km |
A battery having e.m.f. 5V and internal resistance 0.5 W is connected with a resistance of 4.5 W then the voltage at the terminals of battery is
|
(a) 4.5 V |
(b) 4 V |
(c) 0 V |
(d) 2 V |
If the cathode–anode potential difference in an X-ray tube be 105 V, then the maximum energy of X-ray photon can be
| (a) 105 J | (b) 105 MeV | (c) 10–1 MeV | (d) 105 KeV |