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Low-frequency radio waves travel easily through brick and stone and VLF even penetrates sea-water. As the frequency rises, absorption effects become more important. At microwave or higher frequencies, absorption by molecular resonance in the atmosphere (mostly water, H2O and oxygen, O2) is a major factor in radio propagation. For example, in the 58-60 GHz band, there is a major absorption peak which makes this band useless for long-distance use. This phenomenon was first discovered during radar research in World War II. Beyond around 400 GHz, the Earth's atmosphere blocks some segments of spectra while still passes some-this is true up to UV light, which is blocked by ozone, but visible light and some of the near-infrared is transmitted.
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What characteristics of radio waves makes them useful for determining the shape of a galaxy?
Radio waves can penetrate interstellar gas and dust without being scattered or absorbed
What characteristic of radio waves makes them useful for determining the shape of a galaxy?
Radio waves can penetrate interstellar gas and dust without being scattered or absorbed
What characteristic of radio waves makes them useful for determining the shape of the galaxies?
Radio waves can penetrate interstellar gas and dust without being scattered or absorbed
Do radio waves continue into space indefinetly?
Yes, just as all other electromagnetic waves do. They continue until they're absorbed by something.
Does mechinal waves have radio waves?
no, mechanical waves are not radio waves
What characteristics of radio waves makes them useful for determining the shape of a galaxy?
Radio waves can penetrate interstellar gas and dust without being scattered or absorbed
What characteristic of radio waves makes them useful for determining the shape of a galaxy?
Radio waves can penetrate interstellar gas and dust without being scattered or absorbed
What characteristic of radio waves makes them useful for determining the shape of the galaxies?
Radio waves can penetrate interstellar gas and dust without being scattered or absorbed
What layer of atmosphere is radio waves?
the lonosphere
What is an electromagnetic wave spectrum that our atmosphere doesn't absorb?
Radio waves aren't absorbed by the atmosphere.
Do radio waves continue into space indefinetly?
Yes, just as all other electromagnetic waves do. They continue until they're absorbed by something.
Why do hospitals use x rays instead of radio waves for looking in peoples bodies?
Radio waves (along with magnetism) are used for that purpose instead of x-rays in MRI machines. x-rays are absorbed by the body differently than radio waves, so it depends on what in the body is being looked at.
Does mechinal waves have radio waves?
no, mechanical waves are not radio waves
Are radio waves transverse waves or longitudinal waves?
Transverse. Radio waves are electromagnetic waves, which are transverse.
Why electromagnetic wave not heat the medium?
Electromagnetic waves do add heat to the medium they travel through, but only when they are absorbed by matter. This is why sunlight heats the Earth. Lower frequency waves (like radio waves) pass through matter more easily without being absorbed, which is why they're used for communication.
How are electromagnetic waves different to radio waves?
Radio waves ARE electromagnetic waves.
Are radar waves visible?
No. Radar waves are one category of radio waves. Think of all the radio waves that are all around you right now . . . AM radio, FM radio, police and fire radio, highway patrol radio, taxi radio, television picture and sound radio waves, cellphone radio waves, garage-door-opener radio waves, bluetooth radio waves, WiFi waves, microwaves ... and you can't see any of them ! Radar waves can easily be there in the group.
