Atoms and Nuclei (NEET Physics): Questions 51 - 56 of 67
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Question number: 51
» Atoms and Nuclei » Radioactive Decay Law
Question
The half-life of radioactive Radon is 3.8 days. The time at the end of which of the Radon sample will remain undecayedis
(Given log _{10} e = 0.4343)
Choices
Choice (4) | Response | |
---|---|---|
a. | 33 days | |
b. | 3.8 days | |
c. | 76 days | |
d. | 16.5 days |
Question number: 52
» Atoms and Nuclei » Mass-Energy Relation
Question
Energy of each photon obtained in the pair production process will be, if the mass of electron or positron is a. m. u-
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.213 MeV | |
b. | 0.465 MeV | |
c. | 0.123 MeV | |
d. | 0.321 MeV |
Question number: 53
» Atoms and Nuclei » Radioactive Decay Law
Question
Half-life of Bi ^{210} is 5 days. If we start with 50, 000 atoms of this isotope, the number of atoms left over after 10 days is
Choices
Choice (4) | Response | |
---|---|---|
a. | 5, 000 | |
b. | 25, 000 | |
c. | 20, 000 | |
d. | 12, 500 |
Question number: 54
» Atoms and Nuclei » Mass-Energy Relation
Question
Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m ^{2}. The average distance between the earth and the sun is 1.5 ⨯ 10 ^{n} m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)
Choices
Choice (4) | Response | |
---|---|---|
a. | 3.8 ⨯ 10 ^{14} kg. | |
b. | 7.6 ⨯ 10 ^{14} kg | |
c. | 3.8 ⨯ 10 ^{12} kg | |
d. | 4.4 ⨯ 10 ^{9} kg |
Question number: 55
» Atoms and Nuclei » Radioactivity
Question
If _{92} U ^{238} undergoes successively 8 α -decays and 6 β -decays, then resulting nucleus is,
Choices
Choice (4) | Response | |
---|---|---|
a. | _{82} U ^{206} | |
b. | _{82} U ^{214} | |
c. | _{82} U ^{210} | |
d. | _{82} Pb ^{206} |
Question number: 56
» Atoms and Nuclei » Radioactivity
Assertion (Ꭺ)
The mass of β -particles when they are emitted is higher than the mass of electrons obtained by other means.
Reason (Ꭱ)
β -particle and electron, both are similar particles.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is true but Ꭱ is false | |
b. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
d. | Both Ꭺ and Ꭱ are false |