The frequency of an electromagnetic wave is determined by the source of the wave, which is usually an oscillating charged particle. The frequency is directly related to the speed of oscillation of the charged particle and cannot be changed without altering the source itself.
No, changing the wavelength of an electromagnetic wave does not affect its frequency. Wavelength and frequency are inversely proportional, meaning that as one increases, the other decreases. However, this does not change the underlying frequency of the wave.
Yes, the frequency of an electromagnetic wave is constant and does not change as the wave travels through space. This is one of the fundamental properties of electromagnetic radiation.
The frequency of an electromagnetic wave can be affected by the properties of the medium through which it is traveling. For example, the frequency of a wave traveling through a medium with a higher refractive index will be lower compared to the same wave traveling through a medium with a lower refractive index.
Yes, certain external forces such as magnetic fields can alter the frequency of an electromagnetic wave. This phenomenon, known as the Zeeman effect, is a result of the interaction between the electromagnetic wave and the magnetic field, causing a splitting of the spectral lines.