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Radioactivity Free Doubts and Solutions

CBSE - XII Science - Physics - Nuclei

Differentiate between alpha,beta and gamma decay.

Asked by pksunilnair 4th December 2017, 9:22 AM
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CBSE - XII Science - Physics - Nuclei

from boards point of view is it important to learn speed of emmitted alpha particle from the topic alpha decay?
 

Asked by vasturushi 4th November 2017, 12:23 PM
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CBSE - XII Science - Physics - Nuclei

<div>A radioactive material of half-life T was produced in a nuclear reactor at different instants, the quantity produced second time was twice of that produced first time. If now their present activities are <img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=fd6c485cd9be17fdd0cc79d9185e803a.png" alt="A subscript 1 space a n d space A subscript 2" align="middle" /> respectively then their age difference equals:</div> <div>(A) <img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=2327f9a54e5210038efb0b00387b04df.png" alt="fraction numerator T over denominator ln 2 end fraction open vertical bar ln A subscript 1 over A subscript 2 close vertical bar" align="middle" /></div> <div>(B) <img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=3d41e448da59665e9136153d584d09a6.png" alt="T open vertical bar ln A subscript 1 over A subscript 2 close vertical bar" align="middle" /></div> <div>(C)<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=bd419a6c1df8226c8b411c79a4674a47.png" alt="fraction numerator T over denominator ln 2 end fraction open vertical bar ln fraction numerator A subscript 2 over denominator 2 A subscript 1 end fraction close vertical bar" align="middle" /></div> <div>(D) <img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=87017af1f6089b0700bdaf02f49326d3.png" alt="T open vertical bar l n fraction numerator A subscript 2 over denominator 2 A subscript 1 end fraction close vertical bar" align="middle" /></div>

Asked by yugibo 13th April 2016, 9:48 PM
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CBSE - XII Science - Physics - Nuclei

What is the half life period of carbon 14?

Asked by Balbir 30th September 2015, 9:15 PM
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CBSE - XII Science - Physics - Nuclei

Write symbolically the nuclear β+ decay process of. Is the decayed product X an isotope or isobar of ()? Given the mass values m () = 11.011434 u and m (X) = 11.009305 u. Estimate the Q-value in this process. 

Asked by Topperlearning User 10th July 2015, 8:41 AM
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CBSE - XII Science - Physics - Nuclei

can a radioactive nucleus emit an alpha particle and a beta particle simultaneously?

Asked by haider.samina 7th March 2015, 10:40 AM
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CBSE - XII Science - Physics - Nuclei

why would a nucleus want to disintegrate and form a nuclei

Asked by Sourav Jha 6th February 2015, 8:07 AM
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CBSE - XII Science - Physics - Nuclei

What are Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.-particles? In the reaction Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. give the atoms number and mass number of Y.

Asked by Topperlearning User 9th July 2014, 6:53 PM
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CBSE - XII Science - Physics - Nuclei

A radioactive sample contains 2.2 mg of pure Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. which has half life period of 1224 seconds. Calculate

(i) the number of atoms present initially.

(ii) the activity when 5μg of the sample will be left.

Asked by Topperlearning User 9th July 2014, 6:46 PM
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CBSE - XII Science - Physics - Nuclei

State radioactive decay law and hence derive the relation N = No e-λt where symbols have their usual meanings

Asked by Topperlearning User 9th July 2014, 5:10 PM
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CBSE - XII Science - Physics - Nuclei

A radioactive uncleus undergoes a series of decay according to the scheme

Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.

If the mass number and atoms number of A are 180 and 72 respectively, what are there number for A4?

Asked by Topperlearning User 9th July 2014, 4:44 PM
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CBSE - XII Science - Physics - Nuclei

Define decay constant of a radioactive sample. Which of the following radiation α-rays, β-rays and y-rays, (i) Are similar to x - rays? (ii) Are easily absorbed by matter?

Asked by Topperlearning User 9th July 2014, 4:26 PM
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CBSE - XII Science - Physics - Nuclei

 

Complete the following nuclear reactions

(a) 4Be9 + 1H1 →3Li6 + ................

(b) 5B10 + Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. → Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. + ..............

 

Asked by Topperlearning User 9th July 2014, 4:15 PM
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CBSE - XII Science - Physics - Nuclei

How many α and β-partiles are emitted 90Th232 changes to 82Pb208?

Asked by Topperlearning User 9th July 2014, 4:06 PM
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CBSE - XII Science - Physics - Nuclei

Calculate the amount of energy released during the Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. decay of Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. 

Given :

1.atomic mass of Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.=238.05079u

2. atomic mass of Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. = 234.04363

3.atomic mass of Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. = 4.00260 

lu = 931.5 MeV/c2.

Is this decay spontaneous? Give reason.

Asked by Topperlearning User 9th July 2014, 3:56 PM
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CBSE - XII Science - Physics - Nuclei

State the law of radioactive decay. Plot a graph showing the number (N) of undecayed nuclei as a function of time (t) for a given radioactive sample having half life T1/2. Depict in the plot the number of undecayed nuclei at (i) t = 3 T1/2 and (ii) t = 5 T1/2.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

The radioactive isotope D decays according to the sequence If the mass number and atomic number of are 176 and 71 respectively, what is (i) the mass number (ii) atomic number of D?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

Explain, with the help of a nuclear reaction in each of the following cases, how the neutron to proton ratio changes during (i) alpha- decay (ii) beta-decay?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

State the law of radioactive decay. Plot a graph showing the number (N) of undecayed nuclei as a function of time (t) for a given radioactive sample having half life

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

The ground state energy of hydrogen atom is -13.6eV (i) What is the kinetic energy of an electron in the second excited state ? (ii) If the electron jumps to the ground state from the second excited state, calculate the wavelength of the spectral line emitted.   OR  

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

Define ionisation energy. What is its value for hydrogen atom?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

Give the mass number and atomic number of elements on the right hand side of the decay process.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

Define half life  of a radioactive element. Write its S.I. unit. derive expression for half life?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

A radioactive nuclide decays to form a stable nuclide its half life is 3 minutes. What fractions of its 1g will remain radioactive after 9 minutes?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

If the activity of a radioactive substance drops to 1/8 th of its initial value in 30 years, find its half life period?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

A neutron is absorbed by a 3Li nucleus with subsequent emission of alpha particle. Write the corresponding nuclear reaction?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

What fraction of tritium will remain after 25 years? Given half life of tritium as 12.5 years.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Nuclei

The half life period of a radioactive substance is 30 days. What is the time for ¾ th of its original mass to disintegrate?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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