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Atoms Molecules And Nuclei
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Ionisation potential for Lithium atom is
13.6 eV
12.7 eV
25.9 eV
30.1 eV
Half life of substance is 20minutes.
What is the time between 33% decay and 67% decay
20 minutes
30 minutes
25 minutes
40 minutes
Half life of a radio isotope is 50years.
Fraction of the atoms of the material that is left after 100 years is
75%
50%
25%
NONE OF THESE
Minimum energy required for excitation of an electron from the ground state in a hydrogen atom is
2.55 eV
1.81 eV
3.40 eV
13.6 eV
Energy emitted in a hydrogen atom when an electron jumps from 4 th orbit to second orbit is
2.55 eV
1.51 eV
3.40 eV
1.81 eV
Half life period of a radioactive substance is 10 minute, then amount of substance decayed in 40 minutes will be
NONE OF THESE
25%
75%
50%
If 10% of a substance decays in 10 days, then approximate percentage of substance left after after 24 days is
70
80
78
75
Uranium-235 is used as nuclear fuel in a nuclear reactor having power level 1 MW. Amount of fuel needed in one year will be (Given : energy released per fission = 200 MeV)
87 gm
122 gm
103 gm
148.5 gm
A nucleus with A = 235 splits into two nuclei whose mass numbers are in the ratio 2 : 1. Ratio of heavier nuclei is
8.03 fm
4.91 fm
3.85 fm
7.55 fm
Half lives of two radioactive substances are 20 and 40 minutesrespectively.
Initially samples were having equal number of nucle
i. After 80 minutes ratio of the remaining numbers of A and B nuclei will be
1 : 4
1 : 8
1 : 16
16 : 1
Nuclear reator in which uranium-235 is used as fuel, uses 2 kg of uranium-235 in 30days.
Then power output of the reactor will be (given : Energy released per fission = 185 MeV)
69.6 MW
43.5 MW
58.5 MW
73.1 MeV
Ground state energy of hydrogen atom is - 13.6 eV, then energy of the third excited state will be
- 1.51 eV
- 10.2 eV
- 6.8 eV
- 0.85 eV
Ground state energy of hydrogen atom is - 13.6 eV, P.E. of electron in this state will be
+ 13.6 eV
+ 27.2 eV
- 13.6 eV
- 27.2 eV
Energy of a gamma ray photon produced due to the anhiliation of an electron and a proton each of energy 1 MeV is
4 MeV
1 MeV
3 MeV
2 MeV
Distance of closet approach when a 5.0 MeV proton approaches a gold nucleus is
39 fermi
16 fermi
23 fermi
47 fermi
Energy emitted in a hydrogen atom when an electron jumps from 3 rd orbit to second orbit is
6.80 eV
1.81 eV
1.51 eV
3.40 eV
Binding energy per nucleon of deuteron is
1.53 MeV
1.37 MeV
2.01 MeV
1.89 MeV
At a given time there are25% undecayed nuclei in asample.
After 10 second number of undecayed nuclei reduces to 12.5%
. Then mean life of the nuclei will be about
10 sec
20 sec
15 sec
22 sec
Half life of plutonium is 2400years.
If plutonium is stored for 96000 years, then fraction of the material that is left behind is
1 / 4
1 / 8
1 / 16
1 / 2
An electron having charge e revolves around a nucleus of an element having atomic number Z. If 47.2 eV of energy is needed for exciting the electron from second Bohr s orbit to third Bohr s orbit, then value of Z will be
9
4
6
5
1
2
3
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