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

Properties of waves

Extracts from this document...

Introduction

Properties of waves

I. What is a wave
A wave is a disturbance that carries energy through matter or space.

II. Most waves travel through a medium
i. sound travels as a wave
a. the air through which sound travels is its medium
ii. earth quakes make waves called seismic waves that travel through earth
a. medium- the matter through which a wave travels
b. waves that require a medium to travel through are called mechanical waves
1. almost all waves are mechanical waves
2. an exception to this is electromagnetic waves
III. Light does not require a medium
i. light can travel from the sun to the earth across the empty space
ii. this is possible because light waves do not need a medium to t ravel through
iii. light waves consist of changing electric and magnetic fields in space
a. electromagnetic waves- a wave caused by a disturbance in electric and magnetic fields and that does not require a medium
IV. Waves transfer energy
i. waves carry energy because they can do work.
ii. Ii. The bigger the wave is, the more energy it carries
a. A cruise ship moving through water in the ocean could create waves big enough to move a fishing boat up and down a few meters.
iii. Tsunami- a huge ocean wave caused by earthquakes
a.

...read more.

Middle


a. A small ribbon tied in the middle of the rope would help visualize this
ii. as the wave approaches, the ribbon moves up in the air, away fro its resting position.(crest)
iii. as the rope goes past the ribbon, in sinks down past its original resting position(trough)
iv. The motion of each part of the rope is like the vibrating motion of a mass hanging on a spring.
a. As one part of the rope moves up and down, it pulls on the part next to it, transferring energy.
1. in this way, a wave passes along the length of the rope
X. Transverse and Longitudinal waves
i. particles in a medium can vibrate either up and down or back and forth.
ii. waves are often classified by the direction that the particles in the medium move as a wave passes by
XI. Transverse waves have perpendicular motion.
i. in the rope and door knob example, each particle in the rope moves straight up and down as the wave passes by from left to right
a. in theses cases, the motion of the particles in the rope, is perpendicular to the motion of the wave as a whole
b. waves in which the motion of the particles is perpendicular to the motion of the wave as a whole are called transverse waves
1.
...read more.

Conclusion


a. The period is also the time required for one complete vibration of a particle in a medium
b. in equations; the period is represented by the symbol T.
1. Because the period is a time measurement, it is expressed in the SI unit seconds
XVII. Frequency measures the rate of vibrations
i. the frequency of a wave is the number of full wavelengths that pass a point in a given time interval
a. the frequency of a wave also measures how rapidly vibrations occur in the medium, at the source of the wave, or both.
ii. The symbol for frequency is f.
a. the SI unit for measuring frequency is hertz (HZ), named after Heinrich Hertz who in 1888 became the first person to experimentally demonstrate electromagnetic waves.
1. Hertz units measure the number of vibrations per second
iii. You can hear frequencies as low as 20 Hz, and as high as 20,000 Hz.
a. when you hear 20,000 Hz, there are 20,000 compressions hitting your ear every second
iv. Frequency Period equation
frequency = 1/ period
XVIII. Light comes in a wide range of frequencies and wavelengths
i. our eyes can detect light with frequencies ranging from 4.3x 10^14 to 7.5x 10^14
a. light in this range is called visible light
1. The differences in frequency in visible light account for the different colors we see.
ii. Electromagnetic waves also exist at other frequencies that we cannot see directly
a. the full range of light at different frequencies and wavelengths is called the electromagnetic spectrum.

...read more.

This student written piece of work is one of many that can be found in our GCSE Waves 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 Waves essays

  1. Deviation of Light by a Prism.

    Over the next two pages is two graphs plotted in the incident angle range of 30� - 85�, which show the predicted trend in the angle of deviation and the angle of incidence, and the other graph shows the predicted trend, in the variation of the angle of emergence and the angle of incidence.

  2. Investigating the speed of travelling waves in water.

    The v2 against depth graph that was obtained shows that the speed squared is directly proportional to the depth of the water, i.e. as the depth of water increases, the speed of the travelling wave increases in proportion to the depth.

  1. Wave Motion and Definitions

    eg. Sound waves and some Seismic waves. Vibration causing disturbance is in the direction of energy propogation. 2.2.7 Polarisation Occurs only for Transverse waves. Transverse waves may frequently occur in more than one plane at any one time. Eg the wave below may be light from a bulb, note that although two directions are shown there could infact be many more.

  2. Physics Case Study - Do Sunbeds Cause Skin Cancer?

    on a person's skin is the most important indicator of whether they will go on to develop melanoma." The author of the study Tim Spector, professor of genetic epidemiology at King's College London, said "we found two important genes that...

  1. Light is so common that we often take it for granted.

    If light is a wave, then what waves? Water waves are easier to explain. They travel across the surface of the water while the water itself only moves up and down. To scientists of the 1800's, light seemed stranger than water waves because it travels through space from the sun and other stars to the earth.

  2. Soil water content in relation to species diversity in a Pingoe.

    be used must be determine so that all species can be recorded. This was done by counting and recording the number of different spices in the smallest quadrat, then the same was done for the next size up, this procedure was then carried out until the number of spices present remains constant.

  1. The aim of my experiment is to see what factors affect electromagnetism the most ...

    Coil wraps Amps The reason I predict this is because I think that there is a straight line ratio or 'direct proportionality' between the two items. This direct proportionality term means that if it exists within a graph then the two values being used have relation to one another (i.e.

  2. Investigate the relationship between sound pressure level (SPL) and signal amplitude.

    Amplitude Sound Pressure Level Average Range 1 2 3 10 63 62 61 45 2 20 64 63 62 49 2 30 65 64 63 53 2 40 67 65 64 57.333 3 50 68 66 64 61.333 4 60 73.5 67 65.5 66.833 8 70 74.5 69 66.5 71.167

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