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How do we know that EM wave don't need a medium and can travel through vacuum?
Wiki User
∙ 11y ago
Because of all the EM radiation we receive from the sun.
Also . . .
- we can see the moon
- we can see the sun
- we can see other stars
- we can communicate by radio with astronauts on the moon
- we can communicate by radio with the Curiosity on Mars
- we can communicate by radio with our space probes that have left the solar system
- we can bounce light and radio from Earth to moon and back to Earth
Wiki User
∙ 11y ago
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It is possible for an electromagnetic wave to travel through a vacuum?
yes, they can travel.
How do surface waves differ form body waves?
Body waves: seismic waves that travel through the body of a medium Surface waves: seismic waves that travel along the surface of a medium and have a strong effect near the surface of the medium than it has in the interior
Through what do seismic waves travel fastest?
seismic wave travels faster through solid rock and slower through water, but i dont know why!
How do hovercraft travel through really rough surfaces?
They dont travel in wave or swells of more than 1 meter at worse They dont travel in wave or swells of more than 1 meter at worse
What are mediums for light waves?
Light is considered a self-propagating wave. So it does not need a medium, which is why it reaches the earth from the sun. The mediums which dont absorb the light (and therefore allow light to travel through it) depend on the wave length of light. For example a gamma ray (has a very short wavelength) can travel through metal and takes a block of lead to absorb it.
Do sound waves of different frequencies travel at different speeds?
No, light is slowed depending on what medium it travels through. That's why we have the constant ' c ', defined as the speed of light 'in a vacuum'. The actual speed light travels through air, glass, jello, or water, is less than 'c'.
How does vacuum forming work?
i dont know and i dont care
What speed do electromagnetd travel in space?
Electromagnetic waves, including light, can travel at the speed of light in a vacuum, which is approximately 299,792 kilometers per second (186,282 miles per second).
Will sound travel faster through glass or air?
i dont know but the sound will stay more in glass
What are George W Bush's likes and dislikes?
he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel... he like his women family and the people... he dont like to travel...
Why do you not hear explosive sounds produced in the sun?
Sound needs matter to propagate. There's not much matter between us and the sun. Even if there were matter enough, the sound wave is not unidirectional and spreads out. A lot of spreading can be achieved in a distance that takes light 8 minutes to traverse. +++ Indeed, it would spread spherically. It's worth pointing out that although sound cannot reach us from the Sun, the electromagnetic radiation (heat, light, etc) that does reach us is subject to the same inverse-square spreading rule, rather neatly because despite the Sun's size, it is far enough away from us and anything else of significant obstruction to be treated as a spherical source in an infinite volume.
Where is the vacuum cut valve on an 2003 altima?
dont no
