• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Radio Waves

Extracts from this document...

Introduction

Radio Waves

        With wavelengths varying between 0.5 cm to 30,000 m, radio waves have the longest wavelengths in the electromagnetic spectrum and can channel innumerable forms of data through air, usually over millions of miles.  Radio waves are not just transmitted from radio stations and onto one’s boom box; but are also emitted by stars. Technologies such as communication, wireless networking , AM and FM broadcasting, GPS, radars, satellite communication and microwaves rely on radio waves to function. Radio waves are a long-wave pattern of radiation that transfers energy through the interaction of electricity and magnetism.

        In 1864, Scottish physicist James Clerk Maxwell developed the electromagnetic

theory; a mathematical theory that established that magnetism and electricity were associated. In

the 1888, German physicist Heinrich Hertz proved Maxwell's theory by discovering long-

...read more.

Middle

an electric current was produced and formed a spark in the spark gap that helped Hertz detect the

radio waves. Consequently, Hertz’s discovery of the radio waves sparked new inventions and

technologies.  

        The breakthrough of radio waves led many inventions in its field. Guglielmo Marconi used radio waves to invent the Morse code. Eventually, Marconi’s invention was modified  for transmitting voice signals. One of the commercial uses of radio waves is communication. Pilots and taxi cab drivers use radios for communication in order to receive important information. Two-way radios are another use of radio waves that policemen, firemen, and ambulance crew use to report difficulties. Radio waves are also commercially used in transmitting AM, and  FM frequencies and television broadcasts to enrich people’s desires.

...read more.

Conclusion

        In general ways, radio waves are considered non ionizing waves and don’t have adequate energy to alter the anatomical structure of atoms in the human body. However, it is theorized that if a person is exposed to mobile phones or base stations, some of the energy will be absorbed by the tissues at the surface of the body and would lead to a brain cancer or tumor. Nevertheless, the risks of getting a cancer or tumor is miniscule since this energy is extremely small for its effects to take place. In conclusion, the discovery of the radio waves by Heinrich Hertz had ushered a new period of communication, networking, and broadcasting and has led to the usage of many technologies, disregarding the ever so small probability of health hazards.

        

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Waves & Cosmology section.

Found what you're looking for?

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

Here's what a star student thought of this essay

3 star(s)

Response to the question

The candidate attempts to discuss various details of radio waves, though they fail to mention basic information. In doing so, they miss the opportunity to fully present their knowledge on the subject. In addition some of the information given is ...

Read full review

Response to the question

The candidate attempts to discuss various details of radio waves, though they fail to mention basic information. In doing so, they miss the opportunity to fully present their knowledge on the subject. In addition some of the information given is difficult to read, which usually stems from the fact that the candidate hasn’t really understood the information they have provided. Only when you truly understand something can you present it in way that is effortless to read. You should always go back to basics and present information as simply as possible, so that it is clear to the reader, however limited their knowledge of the subject is.

Level of analysis

The candidate launches straight into information regarding radio waves. Therefore they fail to provide a proper introduction for this piece of writing. Having an introduction is crucial; it sets the tone for the whole essay and provides a context. For this essay the introduction should include background information, I would suggest classifying radio waves as electromagnetic waves, followed by a description of an electromagnetic wave and a brief description of the properties specific to radio waves. On the positive side the candidate has clearly undergone independent research as they discuss in detail the experiment which led to the discovery of radio waves. This additional knowledge shows the candidate's interest in their subject and makes the essay more enjoyable to read. I feel that this essay is missing important descriptive information such as the fact that radio waves are produced by electrons oscillating in aerials due to an electric field, and the fact that they can be detected by resonance in electric circuits. This basic information shows a true understanding of radio waves and hence showcases your knowledge and ability. In addition, to achieve a high grade it is a good idea to explore beyond the topic, in this case it would be appropriate to discuss polarisation as radio waves are electromagnetic waves and only these types of waves can be polarised. You could also discuss interference, and perhaps how radio waves are transmitted and received. This shows a breadth of knowledge and indicates to the reader that you understand basic physics principles. Finally though the candidate attempts to conclude their writing, it is a little brief and could be improved. A strong conclusion should summarise the key points mentioned in the essay and include a personal note. This is important as it allows you to leave the reader with a good impression.

Quality of writing

Some of the information provided is a little dull, this could be made more lively with added descriptions, and a wider range of vocabulary. In terms of the presentation of the essay, the second paragraph has spaces between lines, which is unnecessary. I’m assuming this an error, and it can easily be rectified. Also a new paragraph should have been started for the conclusion. Over all the quality of communication in this essay is lower than expected at this level, though in general there is no real issue with spelling or grammar.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by PicturePerfect 17/03/2012

Read less
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 AS and A Level Waves & Cosmology essays

  1. Peer reviewed

    What affects the voltage output of a solar panel?

    3 star(s)

    Background light, the sun coming in from the windows will affect my results. The curtains in the room will be drawn to prevent too much affect on the solar cell. It is inevitable for there to be background reading as the curtains cannot fully block the light from the windows

  2. Determine the value of 'g', where 'g' is the acceleration due to gravity.

    The results are shown below: Experiment Stopped time (s) Reaction time (s) 1 30.053 0.053 2 30.040 0.040 3 30.061 0.061 4 30.054 0.054 5 30.042 0.042 The table above shows the different reaction times as I tried to stop the stop watch at 30 seconds.

  1. Making sense of data - finding a value for the young modulus of a ...

    M BD3 Y = 4 x 9.80 x 0.93 x 3.2475 0.03024 x 0.00567183 = 28.5768 x 3.2475 5.51753*109 = 5.179276343*109 x 3.2475 = 1.6819699925*1010 = 16.819699925*109 N/m2 From my research on, I found out that the Young's Modulus value for wood is:- 13*109 N/m2 By looking at the actual

  2. Investigate any relationship present between the distance between a solar cell and a lamp, ...

    to measure, and does not require sophisticated machinery and the knowledge of them to perform, as changing the colour would. As an object becomes further away, light intensity decreases. The diagram illustrates how the further away an object is, the lesser the degree of the light emitted by the bulb.

  1. What factors affect the period of a Baby Bouncer?

    system since an increase in stiffness should result in a decrease in period time due to less extension. The higher the strength of the spring, the more likely that the oscillation period will be lengthened. * Thickness of the spring: With an increase in thickness it follows that the cross sectional area increases.

  2. Resonance in a Closed Air Column Investigation.

    However the % error for the speed of sound in the different temperature doesn't seem to be reasonable. The same reasons for the error should apply because the same procedure was performed to obtain the 1st resonance for the different temperature.

  1. An experiment to investigate and determine how rubber behaves when tension forces are applied ...

    I were to continue the experiment to further study the elastic limit I predict the graph would flatten out after 11 Newton's were the rubber band would be stretched out of shape, or Hooke's law would come into play. Safety First I have to make sure that I am not

  2. Investigation of the structure of a cantilever beam.

    Now we have to measure the depth of the ruler using a screw gauge. We also have to measure the breadth of the ruler using a vernia calapus. Since we have the measure of the deflection of the ruler, breadth, height, length of the overhang of the ruler we can

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