Our eyes would be like the X-ray film used in hospitals or dentist's offices. X-ray film "sees" X-rays, like the ones that travel through your skin.
It also sees shadows left by things that the X-rays can't travel through like bones or metal. When you get an X-ray taken at a hospital, X-ray sensitive film is put on one side of your body, and X-rays are shot through you.
At a dentist, the film is put inside your mouth, on one side of your teeth, and X-rays are shot through your jaw, just like in this picture. It doesn't hurt at all - you can't feel X-rays. Because your bones and teeth are dense and absorb more X-rays then your skin does, silhouettes of your bones or teeth are left on the X-ray film while your skin appears transparent.
Metal absorbs even more X-rays - can you see the filling in the image of the tooth? When the Sun shines on us at a certain angle, our shadow is projected onto the ground.
Similarly, when X-ray light shines on us, it goes through our skin, but allows shadows of our bones to be projected onto and captured by film. This is an X-ray photo of a one year old girl. Can you see the shadow of what she swallowed? We use satellites with X-ray detectors on them to do X-ray astronomy. In astronomy, things that emit X-rays for example, black holes are like the dentist's X-ray machine, and the detector on the satellite is like the X-ray film.
The toxic effects of ultraviolet UV light, particularly shortwave i. However, the effects of irradiation with visible light remain unclear, although shorter wavelengths are known to be more lethal. Microwaves are a subset of radio waves. Energy is transported in waves. Light is made of discrete packets of energy called photons that travel at the speed of light until they come into contact with other matter. Photons have no mass, but they do have momentum. Likewise, energy from the electromagnetic spectrum has both particle-like and wave-like properties.
Electromagnetic waves are formed by the vibrations of electric and magnetic fields. These fields are perpendicular to one another in the direction the wave is traveling. The number of crests that pass a given point within one second is described as the frequency of the wave and is measured in Hertz Hz. Electromagnetic waves have crests and troughs with the distance between crests called the wavelength. Wavelength is measured as a unit of distance such as mm, cm, nanometer, micrometer, etc.
Skip to main content. Activity Sections Overview Students create and observe wavelengths at both high and low energy levels using safety glasses, rope, and a power drill. Learning Objectives Students will be able to explain that energy travels from the Sun to the Earth by means of electromagnetic waves.
Students will understand that shorter wavelengths have higher frequency and energy. Students will understand that longer wavelengths have lower frequency and energy. These waves are smaller than an atom and can pass through most materials as sunlight passes through glass.
Although X-rays have many beneficial applications, using them requires caution since exposure can cause blindness, cancer and other injuries. X-rays once had novelty uses, such as the shoe-store gadgets that let you see your foot inside a shoe to judge how well it fits.
These devices have long since been outlawed. Today, states require licenses to operate X-ray devices. Ultraviolet, or UV, light gets its name from the fact that its wavelengths are shorter than violet visible light.
Too much can cause sunburn, skin cancer, and retinal damage. Hospitals use shorter-wavelength UV to kill germs in the air, and sewer treatment plants use it to kill bacteria in liquid waste. Light from a germicidal UV lamp can cause blindness if you look directly at it. Because it has longer wavelengths than X-rays, UV causes less damage to tissue, but even so, it is still not completely safe.
Beyond X-rays are even shorter wavelengths called gamma rays.
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