• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10

Each region of the EM spectrum has different uses in everyday life. radio waves These are used for transmitting radio signals, phone signals and television

Extracts from this document...

Introduction

Task four The electromagnetic spectrum is the entire range of radiant energies or wave frequencies. There are seven main regions in the electromagnetic spectrum. These are: radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays. Each section of the EM spectrum has a different wavelength, these are shown in the table below Section of EM spectrum Wavelength (in cm) radio waves > 10 microwaves 10 --> 10 infrared 10 --> 10 Visible light 10 -->10 ultraviolet 10 --> 10 x-rays 10 --> 10 Gamma rays < 10 Each region of the EM spectrum has different uses in everyday life. radio waves These are used for transmitting radio signals, phone signals and television. Also stars and gases in space emit radio waves. Microwaves These are used for cooking, in our microwaves. They can also be used for communication. Infrared This is used for heating, night vision and in remote controls. Visible light This is the light that we see. It is emitted by everything. Ultraviolet Is emitted from the sun, it is what tans our skin. It is also used for sterilising, and in forensic science, to see things such as traces of bodily fluids, which are invisible to the naked eye. ...read more.

Middle

Different pieces of equipment will use different amounts of energy. For example, a light bulb consumes 75 watts of power, a desk top computer and 15'' monitor consumes 150 watts, a water heater consumes 3800 watts and a power station consumes 500 megawatts of power. Energy inputs, outputs and efficiencies A coal fired power station burns coal at a rate of 75kg of coal per second. Each kg of coal releases 27 million joules of energy Total input for power station: Power= work done/ time Power= 75x27 Power= 2025 mj/s So the power station produces 2025 million joules of energy per second. Output= 800 mw Efficiency= 800/ 2025 x 100 = 39.5% A water bath in a lab has a power rating of 2.5 kW. It was used to heat tap water at 17(c to a temperature of 37(c for a biology experiment on enzymes. It took 22mins and 45 secs before the water reached the right temperature. The bath contained 30 litres of water The specific heat capacity of water is 4.2 J kg-1K-1 Total energy used by heating element during the heating period. Power= 2.5 kW Time= 22 mins and 45 secs= 1365 seconds Total energy used (energy output) ...read more.

Conclusion

The filling solution in the reference electrode has oH- ions in it. This generates a millivoltage which is passed on in the same way as in the sensing electrode. The millivoltages are then passed on into the electronic part of the pH meter. The pH meter then takes the inputs from the sensing electrode and the referencing electrode and compares the two values to get a result millivolt reading. The reading in mV is then converted into a pH reading. In modern pH meters both the sensing electrode and the referencing electrode are contained in one glass tube, with the special glass of the sensing electrode protruding from the bottom. The light microscope The purpose of the light microscope is to magnify images. Many factors would have had to be considered when designing this equipment. For example, where the object/specimen would be placed, how the image would be magnified, how we would be able to see the image. These factors are solved by the stage, lenses , eyepiece and built in light sources. Other factors would include, where the microscope would be used, for example, in a teaching lab. This is taken into account by the size of the microscope. It is small enough to sit on the bench of a teaching lab, and relatively inexpensive compared to other microscopes, therefore teaching institutions can afford to purchase more than one for their students. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Peer reviewed

    electomagnet lab

    3 star(s)

    * If the nails are rusted, they should be rubbed with sand paper and weighed again so that the new mass is taken into account. * While wrapping the wire around the piece of iron, one must make sure that the distance between each turn is equal and this distance

  2. Electromagnet lab

    * If the nails are rusted, they should be rubbed with sand paper and weighed again so that the new mass is taken into account. * While wrapping the wire around the piece of iron, one must make sure that the distance between each turn is equal and this distance

  1. The Efficiency of an Electric Motor.

    1204.8 32.8 1.52439 19.3635456 3.52439 1254.8 30.15 1.65837 18.5377878 3.65837 1304.8 27.75 1.8018 17.742018 3.8018 1354.8 24.9 2.00803 16.5299148 4.00803 1404.8 22.1 2.26244 15.2125792 4.26244 1454.8 20.1 2.48756 14.3283252 4.48756 1504.8 17.9 2.7933 13.1986008 4.7933 1554.8 16.25 3.07692 12.380095 5.07692 1604.8 14.65 3.41297 11.5200568 5.41297 1654.8 13.55 3.69004 10.9870446 5.69004

  2. Finding a material's specific heat capacity

    However, after the experiment was carried out and the temperature probes were calibrated with by boiling water, they were found to be very inaccurate. When the water boiled an alcohol thermometer showed the temperature to be around 99�C, but the two temperature probes measured about 94�C.

  1. Choosing a light source

    The diagram below shows how it looks. The way that this light tube works has been explained below. Electrons from the cathode are transmitted into the tube. In side the tube is mercury vapour and argon gas. When the electrons hit the mercury vapour, the vapour turns into gas.

  2. Factors Affecting the Efficiency of a Wind Turbine

    Variable control The windturbine will be of the same size, type and brand. Temperature, windspeed, blade length, number of blades, angle of blades, area of blades and thickness will be kept constant. The only variable changing is the blade shape.

  1. Restoring a Volksempfnger VE 301 GW (Nazi people's radio) This is a piece of ...

    The speaker cloth was original and clean but a bit loose, needing a few of glue. The knobs were perfect - except one screw that was too long. (MAINS VOLTAGE !) If the screws of the knobs are rusted and hard to unscrew use weapon oil or "Caramba" and let it soak over night.

  2. Investigating The Heat Of Combustion Of Alcohols.

    I will now repeat this process with the other 3 alcohols too see if there are any trends. For ethanol I must make sure that I use the correct molecular mass number. The R.M.M of ethanol is 46g. I will now go through the same steps I used for methanol.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work