1
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Suppose an electron is attracted towards the origin by a force $${k \over r}$$ where $$'k'$$ is a constant and $$'r'$$ is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the $${n^{th}}$$ orbital of the electron is found to be $$'{r_n}'$$ and the kinetic energy of the electron to be $$'{T_n}'.$$

Then which of the following is true?

A
$${T_n} \propto {1 \over {{n^2}}},{r_n} \propto {n^2}$$
B
$${T_n}$$ independent of $$n,{r_n} \propto n$$
C
$${T_n} \propto {1 \over n},{r_n} \propto n$$
D
$${T_n} \propto {1 \over n},{r_n} \propto {n^2}$$
2
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
If $${M_O}$$ is the mass of an oxygen isotope $${}_8{O^{17}}$$ , $${M_p}$$ and $${M_N}$$ are the masses of a proton and neutron respectively, the nuclear binding energy of the isotope is
A
$$\left( {{M_O} - 17{M_N}} \right){C^2}$$
B
$$\left( {{M_O} - 8{M_P}} \right){C^2}$$
C
$$\left( {{M_O} - 8{M_P} - 9{M_N}} \right){C^2}$$
D
$${{M_O}{c^2}}$$
3
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In gamma ray emission from a nucleus
A
only the proton number changes
B
both the neutron number and the proton number change
C
there is no change in the proton number and the neutron number
D
only the neutron number changes
4
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half-life period of a ratio-active element $$X$$ is same as the mean life time of another ratio-active element $$Y.$$ Initially they have the same number of atoms. Then
A
$$X$$ and $$Y$$ decay at same rate always
B
$$X$$ will decay faster than $$Y$$
C
$$Y$$ will decay faster than $$X$$
D
$$X$$ and $$Y$$ have same decay rate initially
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