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Science_Lab_Yellow / Lesson 7: Wavelengths Shorter Than Violet Light

Wavelengths Shorter Than Violet Light

What will we be learning today?

  • In this lesson, we are going to learn which wavelengths are shorter than violet light.

  • Which Wavelengths Are Shorter than Violet Light?
     
    The wavelengths of light listed here are shorter than violet light.

    They are invisible but have important properties and uses.


    Ultraviolet Light

     
    Ultraviolet (UV) light is made up of waves just shorter than visible violet light on the spectrum. UV light causes chemical changes. It can produce vitamin D in your body. You need vitamin D for healthy bones and teeth. Ultraviolet light produces vitamin D in milk. Hospitals use ultraviolet light to kill harmful bacteria in equipment used in operating rooms. However, UV light can cause harm. UV light from the Sun can cause a sunburn. Scientists have found that UV light can also cause some forms of cancer on the skin. Cancer is a disease in which cells multiply rapidly with harmful effects.


    Earth is protected from much of the Sun's UV light by the ozone layer. The ozone layer is a part of the upper atmosphere that screens out UV light. However, some chemicals produced by factories are eating away at the ozone layer. Thus more of the Sun's UV light will pass through to Earth's surface. Care is being taken to prohibit the chemicals from being manufactured.


    X Rays and Gamma Rays
     
    The shortest wavelengths of the spectrum-X rays and gamma rays-have great penetrating power. X rays can pass right through most objects. Thicker or denser objects tend to absorb X rays. This means that X rays can produce a picture when they pass through an arm or leg, or your jaw. The denser objects, such as bones and teeth, can show up very clearly on the finished picture.








    Doctors use light boxes to examine X rays.


  • Now complete your worksheet!