1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be
A
$${{24hR} \over {25m}}$$
B
$${{25hR} \over {24m}}$$
C
$${{25m} \over {24hR}}$$
D
$${{24m} \over {25hR}}$$
2
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?
A
0.65 eV
B
1.9 eV
C
11.1 eV
D
13.6 eV
3
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0. number of P species are 4 N0 and that of Q are N0. Half -life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be
A
2 N0
B
3 N0
C
$${{9{N_0}} \over 2}$$
D
$${{5{N_0}} \over 2}$$
4
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is
A
2
B
3
C
4
D
5
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