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CBSE Class 12-science Answered

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Asked by sudheerkapoor67 | 14 Feb, 2018, 03:49: AM
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Speed of wave in a stretched string, begin mathsize 12px style v space equals space square root of F over mu end root end style
F is tension in the string, F = mg, where m is mass of string and g is acceleration due to gravity.
we have to consider the string is getting stretched due to its own weight.

μ is mass per unit length which is m/20 
 
hence begin mathsize 12px style v space equals space square root of fraction numerator m cross times 10 over denominator begin display style bevelled m over 20 end style end fraction end root space equals space square root of 200 space equals space 10 square root of 2 space m divided by s end style
time taken for the pulse = distance / velocity = 20 / (10√2) = √2 s

Answered by Thiyagarajan K | 14 Feb, 2018, 12:59: PM

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CBSE 12-science - Physics
solve option e
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Asked by dasrituparna1999 | 13 Apr, 2024, 06:56: AM
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CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
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CBSE 12-science - Physics
which answer is correct and most appropriate with explanation
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Asked by mishrigupta19319 | 08 Apr, 2024, 06:28: PM
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CBSE 12-science - Physics
8212
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Asked by madhav9119887644 | 07 Apr, 2024, 08:10: PM
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CBSE 12-science - Physics
ans the questions wit reason
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Asked by mishrigupta19319 | 07 Apr, 2024, 11:23: AM
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CBSE 12-science - Physics
I don't know which concept and formula is used
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Asked by adityagalar2007 | 06 Apr, 2024, 01:06: PM
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CBSE 12-science - Physics
what is the mass of the bidy
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Asked by amlanmcob | 06 Apr, 2024, 12:27: PM
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CBSE 12-science - Physics
13./A point charge of 12 µC is located at the centre of a cube of side 1 m. Calculate the electric flux through each face of the cube. (H.S.S.C.E.1999~S) [Ans. 2.26\times10^{5}N~m^{2}C^{-1}]
Asked by hussain221man | 05 Apr, 2024, 08:44: PM
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CBSE 12-science - Physics
A coil of N turns is placed in a magnetic field B such that B is perpendicular to the plane of the coil. B changes with time as B=B0 cos 2元 where T is time period. The magnitude of emf-induced in the coil will be maximum at
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Asked by mishrigupta19319 | 05 Apr, 2024, 12:01: PM
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CBSE 12-science - Physics
a charge of 2microcoulomb experience a force of 6N when placed at a point in an electric field .find electric field at that point
Asked by manishamunda787 | 02 Apr, 2024, 11:07: AM
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