1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A nucleus $${}_Z^AX$$ has mass represented by M(A, Z). If Mp and Mn denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then
A
B.E. = [ZMp + (A $$-$$ Z)Mn $$-$$ M(A, Z)]c2
B
B.E. = [ZMp + AMp $$-$$ M(A, Z)]c2
C
B.E. = M(A, Z) $$-$$ ZMp $$-$$ (A $$-$$ Z)Mn
D
B.E. = [M(A, Z) $$-$$ ZMp $$-$$ (A $$-$$ Z)Mn]c2
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In a radioactive decay process, the negatively charged emitted $$\beta $$-particles are
A
the electrons produced as a result of the decay of neutrons inside the nucleus
B
the electrons produced as a result of collisions between atoms
C
the electrons orbitting around the nucleus
D
the electrons present inside the nucleus
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two radioactive substances A and B have decay constants 5$$\lambda $$ and $$\lambda $$ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be (1/e)2 after a time interval
A
$$4\lambda $$
B
$$2\lambda $$
C
1/$$2\lambda $$
D
1/$$4\lambda $$
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If the nucleus $${}_{13}^{27}Al$$ has a nuclear radius of about 3.6 fm, them $${}_{32}^{125}Te$$ would have its radius approximately as
A
9.6 fm
B
12.0 fm
C
4.8 fm
D
6.0 fm

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