Signals Definition and 410 Threads

  1. J

    Can the Electrical Signals in the Human Brain be Measured?

    Is it possible to measure the voltage, current, frequency of the electrical signals generated by human ‘Brain’? :smile:
  2. A

    Mysterious signals from 1000 light years away

    Interesting stuff.
  3. Z

    Receiving AM Radio Signals from Philadelphia

    AM radio -- please help! Hello, Here is some background info. I don't know if it is all necessary to find a solution but here it is anyway: I am currently living in State College, PA. I would like to be able to listen to an AM radio station broadcasting from Philadelphia, PA...
  4. K

    Can AM Radio Waves Pass Through Glass Better Than FM?

    can AM radio waves pass through glass been than FM radio waves? please explain why/how and how this can be shown in an experiment thx :)
  5. C

    Why do different instruments measure the potential of a wire differently?

    From physics sheet - "all signals (digital a reduction in signal power) as they travel through a system and need amplification at certain intervals." Why is this the case?
  6. S

    Factors affecting cellphone signals

    I am currently studying an International Baccalaureate Physics course, and I am currently in my first year of study (i.e. I'm 16). As part of this, I am doing a presentation on cellphones; not my decision, but to get to the point: If anyone could refer me to some information detailing which...
  7. S

    Factors affecting mobile phone signals

    I am currently studying an International Baccalaureate Physics course, and I am currently in my first year of study (i.e. I'm 16). As part of this, I am doing a presentation on cellphones; not my decision, but to get to the point: If anyone could refer me to some information detailing which...
  8. S

    FTL Signals and the Paradox of Causality

    This is a pretty basic concept of relativity that used to make sense to me but I have since become a little unclear on the issue. The question is how can one violate the principle of causality simply by broadcasting information that travels faster-than-light?
  9. wolram

    How Long Can Radio Signals Retain Information Across Vast Distances?

    it has always seemed incredible to me how little power it takes to transmit radio signals over vast distances,i have read about how these signals are self sustaining, i was wondering how long a signal could retain its information, could it go clear across the galaxy?
  10. Loren Booda

    Relative identifiability of analog vs prime extraterrestrial signals

    SETI's search for alien contact includes detecting intelligent analog transmissions and also those carrying sequences of prime numbers signifying life elsewhere in the Galaxy. What is the relative ease with which SETI can discern rational analog vs prime number transmissions? Is it a waste...