1
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
2
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
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths $$\lambda $$1 : $$\lambda $$2 emitted in the two cases is
A
$${7 \over 5}$$
B
$${27 \over 20}$$
C
$${27 \over 5}$$
D
$${20 \over 7}$$
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be
A
$${{24hR} \over {25m}}$$
B
$${{25hR} \over {24m}}$$
C
$${{25m} \over {24hR}}$$
D
$${{24m} \over {25hR}}$$
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