What is Frequencies: Definition and 411 Discussions

Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency to emphasize the contrast to spatial frequency, and ordinary frequency to emphasize the contrast to angular frequency. Frequency is measured in hertz (Hz) which is equal to one event per second. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example: if a newborn baby's heart beats at a frequency of 120 times a minute (2 hertz), its period, T—the time interval between beats—is half a second (60 seconds divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light.

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  1. T

    Exploring Alternate Dimensions Through String Theory Frequencies

    to begin, a few things i am not a physicist or physics student i am open to corrections and answers via both my email and thread i am a new user and do not know if this is the correct place to post this string theory states that every thing is composed of "strings" running at a certain...
  2. A

    Solving Frequencies Problem: Lowest Tone in Close-End Pipe 200Hz

    The lowest tone to resonate in a close-end pipe of length L is 200Hz. Which is of the following frequencies will not resonate in the pipe? 400Hz 600Hz 1000Hz 1400Hz Anyone know where I should start on this?
  3. M

    Two Oscillator Frequencies on the moon

    Two different simple harmonic oscillators have the same natural frequency (f=2.80 Hz) when they are on the surface of the Earth. The first oscillator is a vertical spring and mass, the second is a pendulum. If both systems are moved to the surface of the moon (g=1.67 m/s2), what is the new...
  4. G

    Wireless Frequencies: Red Light Frequency Visible?

    Okay, this may sound like a dumb question, but if i were to create a wireless signal with a frequency of red light for example, how come i would not see red light... or would i? Is this a difference caused by real and virtual photons?
  5. B

    Is it possible for a string to vibrate at multiple frequencies at once?

    it is often said that the rich sounds produced by e.g. a guitar is due to the string vibrating at several different frequencies at once.. does this mean that there is both the fundamental frequency and several overtones present at the same time.. if so, I don't get it.. how can there be more...
  6. marcus

    Schw. black hole ringing frequencies

    topic of BH ringing freq. came up in "Loop Quantum Gravity" thread in SringBraneLQG forum. I'm starting this thread here in hopes that some regulars here (Labguy, Nereid, others?) can shed additional light. From a pedagogical or intuitive point of view it seems to bring the topic closer to...
  7. M

    Double start - characteristic frequencies of the light

    How can an astronomer recognize a double star from the characteristic frequencies of the light that reaches him from its member stars? I have looked and looked in my textbook but I cannot come up with the answer to this one. Thank you! mmfoley
  8. M

    Double Star characteristic frequencies of light

    How can an astronomer recognize a double star from the characteristic frequencies of the light that reaches him from its member stars? I have looked and looked in my textbook but I cannot come up with the answer to this one. Thank you! mmfoley
  9. G

    Do Magnetic Fields Vary in Frequency Like Light?

    Light is found in different frequencies, which accounts for all of the energy types we find such as visible light, x-rays, gamma rays, infrared, radio waves, etc. Do magnetic fields also exist in different frequency ranges? If so, what are some methods that could be used to manipulate...
  10. M

    Particle / wave duality on a scale of light frequencies.

    Let's present a scale of frequencies of light. For initial we’ll take frequency of visible light. Here particle / wave duality is shown fifty- fifty. At increase or decrease of frequency this proportion is broken. Frequency increasing. Properties of a particle...
  11. C

    Mixing electromagnetic frequencies

    If one can mix certain colors of the visible spectrum to produce other colors, is it possible to mix frequencies from other parts of the electromagnetic spectrum to produce visible colors?
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