1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In a radioactive material the activity at time t1 is R1 and at a later time t2, it is R2. If the decay constant of the material is $$\lambda $$, then
A
R1 = R2
B
R1 = R2e$$-$$$$\lambda $$(t1$$-$$t2)
C
R1 = R2e$$\lambda $$(t1$$-$$t2)
D
R1 = R2(t2/t1).
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The binding energy of deuteron is 2.2 MeV and that of $${}_2^4$$He is 28 MeV. If two deuterons are fused to form one $${}_2^4$$He then the energy released is
A
30.2 MeV
B
25.8 MeV
C
23.6 MeV
D
19.2 MeV
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The radius of germanium (Ge) nuclide is measured to be twice the radius of $${}_4^9$$Be. The number of nucleons in Ge are
A
72
B
73
C
74
D
75
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
In the reaction $${}_1^2$$H + $${}_1^3$$H $$ \to $$ $${}_2^4$$He + $${}_0^1$$n, if the binding
energies of $${}_1^2$$ H, $${}_1^3$$H and $${}_2^4$$He are respectively a, b and c (in MeV),
then the energy (in MeV) released in this reaction is
A
a + b + c
B
a + b $$-$$ c
C
c $$-$$ a $$-$$ b
D
c + a $$-$$ b
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