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CBSE Class 12-science Answered

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 | 04 Jun, 2014, 01:23: PM
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Answered by | 04 Jun, 2014, 03:23: 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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