- #1
flyerpower
- 46
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Suppose a spaceship is at 1 light year distance by Earth and it sends a message back home through an electromagnetic wave, we choose a frequency so that the wave will be a radio wave which requires little energy to produce.
How do i know if the wave will reach the Earth? and what characteristics will it have (besides frequency, wavelength and energy which i suppose are invariable)?
In other words i want to know in what manner is a radio wave detectable and what variables the distance that a radio wave can travel depends on so as it is still detectable after it reaches the destination, OR can a radio wave travel forever and yet the message can be decoded?
How do i know if the wave will reach the Earth? and what characteristics will it have (besides frequency, wavelength and energy which i suppose are invariable)?
In other words i want to know in what manner is a radio wave detectable and what variables the distance that a radio wave can travel depends on so as it is still detectable after it reaches the destination, OR can a radio wave travel forever and yet the message can be decoded?