By Alan Gladwell
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Extra resources for Advances in Physics
3. 5 A. 2 kJ of energy is required to heat a litre of water to 100°C. Assuming 100% efficiency, how long does it take to boil 1 litre of water? 4. How much energy is dissipated by a 100Ω resistor in 10 seconds if 2A of current are flowing? 5. 6 x 10-19 C. How long does it take for a mole (6 x 1023 particles) of electrons to flow through a 40W light bulb on a 240V ring main? Resistance and Conductance Conductance is a measure of how well an artefact (such as an electrical component, not a material, such as iron) carries an electric current.
This is because, before they reach a theoretical boiling point, polymers decompose. Polymers do not have melting points for the same reason. Questions 1. Different crystalline structures have different refractive indexes. Why does this mean that a polycrystalline polymer is translucent? 2. What sort of polymer is a pane of perspex? 3. What sort of polymer does the pane of perspex become when shattered (but still in one piece)? 4. What sort of polymer is a rubber on the end of a pencil? 5. What happens to the translucency of an amorphous polymer when it is put under stress?
FM radio modulates the frequency of a wave, so it needs some variation in the frequencies to allow for transmission of multiple frequencies. Since bandwidth is a frequency, it is the number of bits per. second. The bandwidth required to transmit a signal accurately can be calculated by using 1 as the number of bits, giving the formula: where B equals bandwidth (in Hz), and t equals the time taken to transmit 1 bit of data (in s). The bandwidth of a signal regulates the bit rate of the signal, as, with a higher frequency, more information can be transmitted.