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CBSE Class 12-science Answered

What is bandwidth?(communication and modulation)
Asked by sudipt.kumar | 09 Dec, 2011, 12:00: AM
answered-by-expert Expert Answer
Bandwidth is the difference between the upper and lower frequencies in a contiguous set of frequencies. It is typically measured in hertz, and may sometimes refer to passband bandwidth, sometimes to baseband bandwidth, depending on context.
A key characteristic of bandwidth is that a band of a given width can carry the same amount of information, regardless of where that band is located in the frequency spectrum (assuming equivalent noise level). For example, a 5 kHz band can carry a telephone conversation whether that band is at baseband (as in your POTS telephone line) or modulated to some higher (passband) frequency.
Answered by | 09 Dec, 2011, 04:16: PM

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CBSE 12-science - Physics
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CBSE 12-science - Physics
A parallel-plate capacitor has a plate area of 100c * m ^ 2 and a plate separation of 2.0 cm. has been charged up to 3000 V by a battery. Now, (i) after disconnecting the battery, (ii) keeping the battery connected, the distance between the plates is increased to 5.0 cm intensity of electric field between the plates and the energy of the capacitor. ( epsilon_{0} = 8.85 * 10 ^ - 12 * F * m ^ - 1
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CBSE 12-science - Physics
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CBSE 12-science - Physics
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CBSE 12-science - Physics
Calculate the capacitance of a parallel plate capacitor of each plate of which is of area 50cm^2 and and they are seperated by a dielectric slab of thickness 2mm of dielectric constant.
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