The atomic mass of an element $10 X^{20}$ is 19.98170 amu. The binding energy per nucleon of that element is: [given mass of neutron = 1.00867amu and mass of proton = 1.00783 amu and 1amu = 931 MeV ]
$17.66 \mathrm{MeV} /$ nucleon
$ 8.533 MeV /$ nucleon
$85.33 \mathrm{MeV} /$ nucleon
$170.66 \mathrm{MeV} /$ nucleon
Find the mass of oxygen gas with which $1.882 \times 10^{23}$ degrees of freedom are associated at N.T.P. Given: Molar mass of diatomic gas, oxygen is $32 \mathrm{~g} \mathrm{~mol}^{-1}$ and oxygen molecule possess three translational and two rotational degrees of freedom.
32 g
5 g
16 g
2 g
A metallic circular loop is placed with its plane perpendicular to a uniform magnetic field of 0.3 T . If the radius of the loop decreases at a constant rate of $2 \mathrm{~mm} \mathrm{~s}^{-1}$, what will be the induced emf in the loop, when the radius of the loop becomes 5 cm .
$1.5 \times 10^{-6} V$
$0.75 \times 10^{-6} V$
$1.84 \times 10^{-6} V$
$1.89 \times 10^{-4} V$
What is the minimum wavelength of radiation required to detect a p-n junction diode made of a semiconductor having band gap 3.3 eV .
[Planck's constant $h=6.6 \times 10^{34} \mathrm{~J} . \mathrm{s}$ ]
$3300^{\circ} \mathrm{A}$
$4800^{\circ} \mathrm{A}$
$3750^{\circ} \mathrm{A}$
$7500^{\circ} \mathrm{A}$
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