1
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
$$6.8$$ $$eV.$$
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
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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