1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential $$V$$ and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio $$\left( {{{ch\arg e\,\,on\,\,\,the\,\,ion\,\,} \over {mass\,\,of\,\,the\,\,ion}}} \right)$$ will be proportional to
A
1/R2
B
R2
C
R
D
1/R
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 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
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