Nuclear Physics

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Nuclear Physics

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3.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance

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After 1a and 2 ẞ emissions 

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A radioactive element emits 200 particles per second. After three hours 25 particles per second are emitted. The half-life period of element will be

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 Curie is a unit of

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The decay constant of radium is 4.28×10^-4 per year. Its half-life will be

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 In a radioactive substance at t = 0, the number of atoms is 8×10^4. Its half-life period is 3 years. The number of atoms 1×10^4 will remain after interval.

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The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 second. Its half-life is

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 1 amu is equivalent to

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 Which of the following cannot be emitted by radioactive substance during their decay?

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After 280 days, the activity of radioactive sample is 6000 disintegration per second. The activity reduces to 3000 disintegration per second after an-other 140 days. The initial activity of the sample in disintegration per second is

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 A sample contains 10 mg of radio-active material of half-life 270 days. After 540 days the mass of radio-active material left will be

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What percentage of original radioactive atom is left after five half-lives?

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 In any fission process the ratio
( mass of fission products / mass of parents nucleus) is:

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Fusion reaction takes place at high temperature because

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The half-life of a certain radioactive element is such that 7/8 of a given quantity decays in  12 days. What fraction remains undecayed after 24 days? 

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The difference between U235 and U238 atom is that

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Neutron decay in the free space is given as follows 

0n1 →  1H1 + -1e° +[ ]

Then the parenthesis represents an 

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The half-life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be 

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A radioactive nucleus 92X235 decays to 91Y231. Which of the following particles are emitted

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The decay constant of a radioactive element is 0.01 per second. Its half-life period is

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A sample contains 16 gm of a radioactive material, the half life of which is two days.  After 32 days, the amount of radioactive material left in the sample is

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The decay constant of radium is 4.28×10^-4 per year. Its half-life will be

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 The percentage of radioactive nucleus that remains undecayed after 5 half-lives is nearly

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 The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 seconds. Its half-life is

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A radioactive substance is at t=0, the number of atoms is 8×10^4. Its half-life period is 3 years. The number of atoms 1×10^4 will remain after interval

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  9038Sr decays to 9039Y by

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One atomic mass unit is equal to

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Quarks are basic building block of

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 The mass of the nucleus is always less that the total mass of the protons and neutrons that make up the nucleus. The difference of the two masses is called

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A fusion reaction is initiated with help of

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The best place to store/dump nuclear waste is

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 For atomic nucleus, the binding energy per nucleon ____with increase in mass number

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 Which of the following factor measure the stability of radioactive element? 

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One reaction which might be used for controlled nuclear fusion is shown.

37Li + 12H → 2( 24He) + X

What is particle X?

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Which element was used in atomic bombs dropped at Hiroshima and Nagasaki

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The fission of U238 is possible by

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A substance reduces to th of its original mass in 2 hours. The half-life period of the 16 substance is:

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15 In the following nuclear reaction, how many a and ẞ particles are emitted?

92X 235 → 82Y-207 

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The half-life of a radioactive element which has only1/32 of its original mass left after a lapse of 60 days is:

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 The percentage of the original of a radioactive material left after five half-lives is approximately:

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One curie is equal to 

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Which one of the following is undeflected by electric or magnetic field?

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The phenomenon of spontaneous disintegration of heavier elements (Z>82) into lighter nuclei with the emission of three types of radiation is

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Three fourths of the radioactive nuclei present in a radioactive sample decay in 3/4s. The half-life of the sample is:

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What fraction of a radioactive material will get disintegrated in a period of two half- lives? 

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Half-life of a radioactive material depends on:

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The most penetrating radiation out of the following is:

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In the reaction: 2412Mg + 42He→ x14Si+10n,  x is:

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The half-life of the isotope 2411Na is 15 hours. How much times does it take for 7/8  th of a sample of this isotope to decay?

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In an a-decay

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Radioactivity was discovered by

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