1
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In the nuclear decay given below

$${}_Z^AX \to {}_{Z + 1}^AY \to {}_{Z - 1}^{A - 4}B{}^ * \to {}_{Z - 1}^{A - 4}B,$$

the particles emitted in the sequence are
A
$$\gamma $$, $$\beta $$, $$\alpha $$
B
$$\beta $$, $$\gamma $$, $$\alpha $$
C
$$\alpha $$, $$\beta $$, $$\gamma $$
D
$$\beta $$, $$\alpha $$, $$\gamma $$
2
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be
A
$${\left( 3 \right)^{1/3}}:1$$
B
1 : 1
C
1 : 3
D
3 : 1
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two radioactive materials X1 and X2 have decay constants $$5\lambda $$ and $$\lambda $$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that X2 will be 1/e after a time
A
1/4$$\lambda $$
B
e/$$\lambda $$
C
$$\lambda $$
D
$${1 \over 2}\lambda $$
4
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
The ground state energy of hydrogen atom is $$-$$ 13.6 eV. When its electron is in the first excited state, its excitation energy is
A
10.2 eV
B
0
C
3.4 eV
D
6.8 eV
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