3D ultrasound image
3D ultrasound photo.
"in space no one can hear you scream". Sound does not travel in a vacuum.
CAT (CT) scanner
Computer (Axial) Tomography scanners take x-ray slices (tomographs) at mm distances along the body. The images taken can then be built up, using a computer, to produce a detailed (3D) picture. Sometimes a contrast dye is used to enhance the definition.
More detailed CMB image with the signal from our Galaxy removed showing temperature fluctuations of +-200 microKelvin
The energy of these transverse waves increases with increasing frequency.
Electromagnetic Spectrum - Harm
Chart detailing some of the harmful effects of the electromagnetic radiation.
Electromagnetic Spectrum - Uses
Chart detailing some of the uses of electromagnetic radiation.
Nice reference for the electromagnetic spectrum
Graphite diffraction pattern
Graphite electron diffraction pattern from the fluorescent screen of a Teltron tube. In wave particle duality this is evidence for the wave nature of electrons.
Handout - Reflection
Handout showing red laser light being reflected and refracted by a semicircular glass (plastic) block. Light is refracted at angles less than the critical angle and reflected at angles greater than the critical.
Handout - Refraction
Handout showing red laser light being refracted by a semicircular block and an illustration of a spectrum being formed by refraction
Handout - Refraction (magic)
Optical illusions using refraction
Handout - Scanning by reflection
Some examples of where ultrasound can be used
Handout - Seismic waves
Handout showing p and s waves and how they provide evidence for the structure of the Earth's interior.
- Hydrogen Emission Spectra
How to tell if the water is hot !
Infra red - head
infra red image
- Line Spectra
From Planck's 1900 experiment where Planck showed that energy had to be quantised.
- Prism spectrum
- Radar screen
Radiotelescope - Arecibo
Picture courtesy of the NAIC - Arecibo Observatory, a facility of the NSF.
The World's largest and most sensitive radiotelescope located in Arecibo, Puerto Rico.
305m fixed reflecting surface suspended in a natural limestone sinkhole. The receiver is supported some 150m above. Used by, amongst others, SETI. Opened Nov 1963
Radiotelescope - Very Large Array
Very Large Array in New Mexico is composed of 27, 25 metre diameter, antenna in a Y-shape formation, on rail tracks, electronically combined to give the resolution of an antenna 36 km across and the sensitivity of a dish 130m across.
Diagram showing the creation of a real image and how the magnification can be calculated
- Ripples (concentric)
Knowing the speed of sound in water, the formula speed = distance / time and a computer, it is possible to use ultrasound to produce an image of the sea bed.
Sources of infrasound
Acoustic waves with low frequencies, below 20Hz, are called infrasound and are produced by a variety of natural and man-made sources. You could add to this picture: Animal communications and detection of animal movements.
Spanner & nut
Tectonic plate boundaries
From the NASA Goddard Space Flight Center. Plate boundaries are shown in greeny-blue, earthquakes with yellow dots and recent volcanoes as red triangles.
The Photoelectric Effect
The Heinrich Hertz experiment first carried out in 1881 as a precursor the Michelson Morley experiment in 1887.
Total Internal Reflection
Red laser light reflected inside a curved plastic rod
- Ultrasound - scan
Simple diagram showing a virtual image seen in a mirror. It is not possible to project a virtual image.
Useful as a reference when looking at absorption and emission spectra.
Basic diagram of a wave. Amplitude = maximum displacement from the mid point, Wavelength = length/distance of a single wave, Frequency = number of waves passing a point per second. Speed of sound in air 330m/s. Speed of light in a vacuum 300,000,000 m/s
X-Ray - ankle
A colour enhanced x-ray of the ankle of a lady wearing high heels.
X-Ray body scan
Actually a fake picture of what a full body scan might look like.
X-Ray of lorry
An x-ray of a statue of Sheba (similar to the one at CERN) taken at the Rotterdam customs. The 9.3MeV source is strong enough to distinguish between a 1mm copper wire and 30cm of steel.
- X-ray tractor