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CBSE Class 12-science Answered

Hi PL answer Tomo I have exam 
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Asked by jain.pradeep | 03 May, 2019, 04:46: PM
answered-by-expert Expert Answer
(B) III only
 
AS the tuning knob is changed, tension in the string is changed. Velocity of wave in the string depends on tension.
Wavelength depends on length of string, hence does not depend on tension.
Frequency changes with tension, because tension changes the velocity of wave.
Answered by Thiyagarajan K | 04 May, 2019, 06:32: AM

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CBSE 12-science - Physics
Electric sheilding 
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CBSE 12-science - Physics
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CBSE 12-science - Physics
A dumbbell consists of two masses A and B each of mass m joined by a light rod of length l with mass B attached to a suspension point O by a light rod of length l as shown in figure. Find the minimum required speed with which mass A to be projected horizontally so that the system completes the vertical circular motion.
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CBSE 12-science - Physics
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CBSE 12-science - Physics
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CBSE 12-science - Physics
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Asked by mohapatraswetalina88 | 21 Apr, 2024, 12:18: PM
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CBSE 12-science - Physics
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CBSE 12-science - Physics
explain
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CBSE 12-science - Physics
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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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