1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is
A
1
B
4
C
0.5
D
2
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is
A
15
B
30
C
45
D
60
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength $$\lambda $$. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be
A
$${{16} \over {25}}\lambda $$
B
$${9 \over {16}}\lambda $$
C
$${{20} \over 7}\lambda $$
D
$${{20} \over {13}}\lambda $$
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Given the value of Rydberg constant is 107 m$$-$$1, the wave number of the last line of the Balmer series in hydrogen spectrum will be
A
0.25 $$ \times $$ 107 m$$-$$1
B
2.5 $$ \times $$ 107 m$$-$$1
C
0.025 $$ \times $$ 104 m$$-$$1
D
0.5 $$ \times $$ 107 m$$-$$1
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