1
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
A
2 $$ \to $$ 1
B
3 $$ \to $$ 2
C
4 $$ \to $$ 2
D
4 $$ \to $$ 3
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive nucleus is 50 days. The time invertal (t2 $$-$$ t1) between the time t2 when $${2 \over 3}$$ of it has decayed and the time t1 when $${1 \over 3}$$ of it had decayed is
A
30 days
B
50 days
C
60 days
D
15 days
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after
A
60 s
B
80 s
C
20 s
D
40 s
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If the nuclear radius of 27Al is 3.6 fermi, the approximate nuclear radius of 64Cu in fermi is
A
2.4
B
1.2
C
4.8
D
3.6
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