1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work functions 5.01 eV, when ultraviolet light of 200 nm falls on it, must be
A
2.4 V
B
$$-$$ 1.2 V
C
$$-$$ 2.4 V
D
1.2 V
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A source S1 is producing, 1015 photons per second of wavelength 5000 $$\mathop A\limits^ \circ $$. Another source S2 is producing 1.02 $$ \times $$ 1015 photons per second of wavelength 5100 $$\mathop A\limits^ \circ $$. Then, (power of S2)/(power of S1) is equal to
A
1.00
B
1.02
C
1.04
D
0.98
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
The energy of a hydrogen atom in the ground state is $$-$$ 13.6 eV. The energy of a He+ ion in the first excited state will be
A
$$-$$ 13.6 eV
B
$$-$$ 27.2 eV
C
$$-$$ 54.4 eV
D
$$-$$ 6.8 eV
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is
A
$${\log _e}{2 \over 5}$$
B
$${5 \over {{{\log }_e}2}}$$
C
5log102
D
5loge 2
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