This question contains Statement -1 and Statement-2. Of the four choices given after the statements,
Choose the one that best describes the two statements.
Statement – I: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
and
Statement – II: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.
Statement – 1is false, Statement – 2 is true.
Statement – 1is true, Statement – 2 is true; Statement -2 is correct explanation for Statement-1.
Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.
Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.
If M0 is the mass of an oxygen isotope 8O17 , Mp and MN are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is
(M0 – 8MP) C2
(M0 – 8MP – 9MN) C2
M0C2
M0C2
In gamma-ray emission from a nucleus
both the neutron number and the proton number change
there is no change in the proton number and the neutron number
only the neutron number changes
only the neutron number changes
The half-life period of a radio-active element X is same as the mean life-time of another radio-active element Y. Initially, they have the same number of atoms. Then
X will decay faster than Y
Y will decay faster than X
X and Y have same decay rate initially
X and Y have same decay rate initially
When 3Li7 nuclei are bombarded by protons, and the resultant nuclei are 4Be8 , the emitted particles will be
neutrons
alpha particles
beta particles
beta particles
The ‘rad’ is the correct unit used to report the measurement of
the rate of decay of radioactive source
the ability of a beam of gamma ray photons to produce ions in a target
the energy delivered by radiation to a target.
the energy delivered by radiation to a target.
If the binding energy per nucleon in and nuclei are 5.60 MeV and 7.06 MeV respectively, then in the reaction
energy of proton must be
39.2 MeV
28.24 MeV
17.28 MeV
17.28 MeV
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to l/8. The thickness of lead which will reduce the intensity to l/2 will be
6 mm
9 mm
18 mm
18 mm
A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1 /2 m away, the number of electrons emitted by photocathode would
decrease by a factor of 4
increase by a factor of 4
decrease by a factor of 2
decrease by a factor of 2
Starting with a sample of pure 66Cu, 7/8 of it decays into Zn in 15 minutes. The corresponding half-life is
10 minutes
15 minutes
5 minutes
5 minutes