By Alan Gladwell

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The lowest frequency sound wave humans can hear has a frequency of approximately 20Hz. Given that the speed of sound in air is 343ms-1, what is the wavelength of the lowest frequency human-audible sound? Phasors Consider the image on the right. It shows a wave travelling through a medium. The moving blue dot represents the displacement caused to the medium by the wave. It can be seen that, if we consider any one point in the medium, it goes through a repeating pattern, moving up and down, moving faster the nearer it is to the centre of the waveform.

How much charge do 1234 electrons carry? 2. How many electrons does is take to carry 5 C of charge? 3. The total charge on 1 mole of electrons (6 x 1023 particles) is equal to 1 faraday of charge. How many coulombs of charge are equal to 1 faraday? Current Current is the amount of charge (on particles such as electrons) flowing through part of an electric circuit per second. Current is measured in amps (usually abbreviated A), where 1 amp equals 1 coulomb of charge per. second. The formula for current is: ([The triangle (delta) means change in the quantity]) i1 + i4 = i2 + i3 where I = current (A), Q = charge (C) and t = time (seconds).

What is the bandwidth of the connection? 4. The broadband connection in question two is used to upload a 1Mbyte image to a website. How long does it take to do this? Charge Electrons, like many other particles, have a charge. While some particles have a positive charge, electrons have a negative charge. 6 x 10-19 coulombs. Coulombs (commonly abbreviated C) are the unit of charge. One coulomb is defined as the electric charge carried by 1 ampere (amp) of current in 1 second. It is normal to ignore the negative nature of this charge when considering electricity.

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