# EM spectrum

Jack
Is there an electromagnetic wave with a higher frequency than that of of gamma rays?

Is is possible for us to change the frequency of a wave?

Mentor
Originally posted by Jack
Is there an electromagnetic wave with a higher frequency than that of of gamma rays?

Is is possible for us to change the frequency of a wave?
I think gamma waves are as high as they get, but I'm not sure.

The frequency of a wave can be changed through interaction wih gravity or doppler shift. I think those are the only ways.

Mike H
Most EM spectrum tend to cut off at gamma rays since that's about the most energetic radiation we see, but in principle you could have EM radiation with smaller wavelengths.

Am guessing that you're not referring to reradiated EM waves (e.g. light is absorbed by some material and then reradiated at a lower frequency OR sum frequency generation), nor some experimental laser techniques where you're working with entire pulses of laser light, so am not sure otherwise on the second part of the original post.

Staff Emeritus
Gold Member
The term 'gamma' refers to any EM radiation with energy greater than about 100 keV. It is unbounded -- any photon with energy > 100 keV is gamma radiation.

- Warren

Jack
What is heat radiated out from a hot object as?

Staff Emeritus
Gold Member
You can easily calculate the peak of the blackbody spectrum for any given temperature; that will give you a rough idea of the dominant frequency radiated by any thermal body at that temperature.

- Warren

mark726
Chroot, don't you do that by using Wien's law? Then you can just do Peak Wavelength=(2.9*10^7)/T. T is in kelvins, and then the peak comes out in angstroms.