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CBSE Class 12-science Answered

from boards point of view is it important to learn speed of emmitted alpha particle from the topic alpha decay?
 
Asked by vasturushi | 04 Nov, 2017, 12:23: PM
answered-by-expert Expert Answer
It is not so important question. Since it is XII science boards, you should have knowledge of everything that is within the scope of the syllabus.
Answered by Gajendra | 30 Nov, 2017, 05:19: PM

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CBSE 12-science - Physics
55Cs124(Z=55,A=124) has a half life of 30.8s. (a) If we have 7.8 microgram initially, how many nuclei are presents? How many are present 2 min later? (b) What is the activity at this time? (c) After how much time will the activity drop to less than about 1 per second?
Asked by arjunsah797 | 16 May, 2022, 02:17: PM
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CBSE 12-science - Physics
how are we supposed to solve this question
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Asked by merinlijo_20002 | 17 Jun, 2020, 10:05: AM
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CBSE 12-science - Physics
Carbon-14(C14) decays at a constant rate in such a way that it reduces to 50% in 5568 years. Find the age of an old wooden piece in which the carbon is only 25% of the original.
Asked by rajubarman | 01 Dec, 2019, 10:03: AM
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CBSE 12-science - Physics
Radioactive nuclei 
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Asked by alanpeter9611 | 23 Feb, 2019, 07:47: PM
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CBSE 12-science - Physics
Radioactive elements 
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Asked by alanpeter9611 | 22 Feb, 2019, 11:24: PM
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CBSE 12-science - Physics
Half-life period of a radioactive sample is 2 days. If the number of nuclei initially present isN subscript 0, find the number of nuclei present after 8 days?
Asked by sd2021667 | 04 Dec, 2018, 04:46: PM
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CBSE 12-science - Physics
figure for 13.6 in chapter nuclei  
Asked by silladech | 16 Nov, 2018, 11:14: AM
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CBSE 12-science - Physics
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 | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Physics
How many α and β-partiles are emitted 90Th232 changes to 82Pb208?
Asked by Topperlearning User | 09 Jul, 2014, 04:06: PM
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CBSE 12-science - Physics
  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 | 09 Jul, 2014, 04:15: PM
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