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# Waves.Aim To find out whether drop height, depth or both affect the speed of a wave.

Extracts from this document...

Introduction

Science Coursework

### An introduction to waves

Mechanical Waves are waves, which propagate through a material medium (solid, liquid, or gas) at a wave speed, which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves.

In a longitudinal wave the particle displacement is parallel to the direction of wave propagation. The particles simply oscillate back and forth about their individual equilibrium positions.

In a transverse wave the particle displacement is perpendicular to the direction of wave propagation. The particles do not move along with the wave; they simply oscillate up and down about their individual equilibrium positions as the wave passes by.

Stacey Owen

Candidate no: 0126

Hampton Community College

Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. The radius of the circles decreases as the depth into the water increases.

If the radius of the circles decreases, this means that the wavelength of the wave increases. If the wavelength increases, the speed of the wave therefore increases.

Middle

3.0

3.5

2.5

3.4

3.2

2.7

2.7

2.5

2.5

2.8

3.0

2.7

2.3

2.5

2nd set of results

 Depth /Drop height 0.5 1 1.5 2 2.5 0.5 6.4 6.3 6.4 6.5 6.4 1 4.8 4.6 4.7 4.4 4.6 1.5 3.7 3.8 3.6 3.7 3.8 2 3.1 3.1 3.5 3.1 3.5 2.5 3 2.6 3 2.7 2.8

If you look at these two sets of results, you can see that that drop height results goes across and the depths go down. If you look at the differences of the result that go across there is not much difference whereas if you look at the results which

Conclusion

1. The results follow my prediction.
2. All the points for each drop height line are close to the lines of best fit.

I could have made my experiment more accurate if I had taken more sets of readings, I would have obtained a better average.

I’m pretty pleased with the suitability of my experiment for the following reasons:

1. I was able to get two good and valid sets of readings using the equipment and time allowed.
2. I made sure that the test was as fair as possible by putting the water in then measuring one end, the middle and the other end of the tray when the water was put in there. Also if there was any spillage I would measure it and then fill it back to the right depth.

There was not any anomalous result; they were all very close together. Therefore I’m happy that my evidence is accurate and reliable enough to support my conclusion.

To improve and extend this investigation I could use the same method to investigate a greater range of input variables e.g.

• Temperature
• Liquids
• Distances

Stacey Owen

Candidate no: 0126

Hampton Community College

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