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Exploring Invisible Waves: Sound Waves and Electromagnetic Waves

Discover the invisible waves that surround us every day - sound waves and electromagnetic waves. Learn how sound waves can travel through different materials and how electromagnetic waves can travel through air, solids, and even empty space. Explore the world of radio waves and their applications in astronomy. Understand the concepts of wavelength and frequency and how they determine the characteristics of different waves.

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Exploring Invisible Waves: Sound Waves and Electromagnetic Waves

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  1. Discussion slide- info from http://science.hq.nasa.gov/kids/imagers/ems/index.html • Have you ever seen a flag on a windy day? The wind creates waves in the flag. • Have you ridden an ocean wave? • You can see them • You can feel them • You can make them There are other kinds of waves. We cannot see these waves, but we experience them every day. Sound waves and electromagnetic waves are examples of invisible waves. Sound can travel through anything made of molecules - even water! Electromagnetic waves are different from sound waves because they do not need molecules to travel. This means that electromagnetic waves can travel through air and solid materials - but they can also travel through empty space.

  2. Electromagnetic Waves- EM Electric wave is Blue Magnetic wave is Red

  3. What do Radio Waves show us? Many astronomical objects emit radio waves, but that fact wasn't discovered until 1932. Since then, astronomers have developed sophisticated systems that allow them to make pictures from the radio waves emitted by astronomical objects. Radio telescopes look toward the heavens at planets and comets, giant clouds of gas and dust, and stars and galaxies. By studying the radio waves originating from these sources, astronomers can learn about their composition, structure, and motion. Radio astronomy has the advantage that sunlight, clouds, and rain do not affect observations.

  4. Electromagnetic Spectrum Copy this slide How are electromagnetic waves different? Wavelength- Distance from one crest to the next crest in a wave Frequency- number of waves in a set amount of time.

  5. Wavelength increases or decreases? Frequency increases or decreases?

  6. Radio waves image of the Sun Microwave image of the Sun

  7. Visible light image of the Sun Infrared image of the Sun

  8. Ultraviolet image of the Sun X-ray image of the Sun

  9. Gamma image of the Sun

  10. Images of Crab nebula taken at different wavelengths.

  11. Microwaves Infrared X-rays Ultraviolet- (UV)

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