1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
In the nuclear fusion reaction $$${}_1^2H + {}_1^3H \to {}_2^4He + n$$$
given that the repulsive potential energy between the two nuclei is $$ \sim 7.7 \times {10^{ - 14}}J$$, the temperature at which the gases must be heated to initiate the reaction is nearly
[ Boltzmann's Constant $$k = 1.38 \times {10^{ - 23}}\,J/K$$ ]
A
$${10^7}\,\,K$$
B
$${10^5}\,\,K$$
C
$${10^3}\,\,K$$
D
$${10^9}\,\,K$$
2
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit
$$\eqalign{ & \left( i \right)\,\,\,\,\,\,\,electrons\,\,\,\,\,\,\,\,\,\,\,\,\left( {ii} \right)\,\,\,\,\,\,\,protons \cr & \left( {iii} \right)\,\,\,H{e^{2 + }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\left( {iv} \right)\,\,\,\,\,\,\,neutrons \cr} $$

The emission at instant can be

A
$$i, ii, iii$$
B
$$i, ii, iii, iv$$
C
$$iv$$
D
$$ii, iii$$
3
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
If $$13.6$$ $$eV$$ energy is required to ionize the hydrogen atom, then the energy required to remove an electron from $$n=2$$ is
A
$$10.2$$ $$eV$$
B
$$0$$ $$eV$$
C
$$3.4$$ $$eV$$
D
$$6.8$$ $$eV.$$
4
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
If $${N_0}$$ is the original mass of the substance of half-life period $${t_{1/2}} = 5$$ years, then the amount of substance left after $$15$$ years is
A
$${N_0}/8$$
B
$${N_0}/16$$
C
$${N_0}/2$$
D
$${N_0}/4$$
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