Frequencies Definition and 412 Threads

Hello, I've been thinking about why (elementary) transformer efficiency drops drastically at very low frequencies. I know hysteresis effects play a major role in reducing efficiency at high frequencies, but why low? I realize that as we reduce the frequency of the emf, we're making the...

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...

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?

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...

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?

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...

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...

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

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

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...

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...

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?