- If superconducting lead has critical temperature of 7.26 K at zero magnetic field and a critical field of 8\times10^5 A/m at 0K, the critical field at 5K is :
- 6.3\times 10^5 A/m
- 2.5\times 10^5 A/m
- 4.2\times 10^5 A/m
- 1.5\times 10^5 A/m
- The ratio of the sizes (in terms of radii) of ^{208}_{82}Pb and ^{26}_{12}Mg nuclei is approximately:
- 2
- 4
- 2\sqrt{2}
- 8
- What is the energy of a gamma radiation backscattered at an angle 180^o, if the incident energy is 10 MeV?
- 10 MeV
- 5 MeV
- 0.511 MeV
- 0.25 MeV
- Ionisation chamber is effectively used for the measurement of :
- Radiation
- Radiation Dose
- strength of radiation
- Energy of radiation
- A satisfactory quenching gas in G.M. tube must have the following property:
- Ionisation potential should be equal to the main counting gas in the tube
- Ionisation potential should be higher than that of main counting gas in the tube
- It must have very narrow ultraviolet absorption bands
- When in excited state it must prefer to dissociate rather than to de-excite by the emission of photon
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Notice
Wednesday, 14 December 2016
Problem set 40
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