Table of Contents
What is the frequency in hertz of an electromagnetic wave?
| Region | Wavelength | Frequency |
|---|---|---|
| Visible (blue) | 400 nm | 7.5 × 1014 Hz |
| Visible (red) | 700 nm | 4.3 × 1014 Hz |
| Infrared | 10000 nm | 3 × 1013 Hz |
| Microwave | 1 cm | 30 GHz |
What is the wavelength of electromagnetic radiation with a frequency of 3 * 10 10?
Regions of the Electromagnetic Spectrum
| Wavelength (m) | Frequency (Hz) | |
|---|---|---|
| Microwave | 1 x 10-3 – 1 x 10-1 | 3 x 109 – 3 x 1011 |
| Infrared | 7 x 10-7 – 1 x 10-3 | 3 x 1011 – 4 x 1014 |
| Optical | 4 x 10-7 – 7 x 10-7 | 4 x 1014 – 7.5 x 1014 |
| UV | 1 x 10-8 – 4 x 10-7 | 7.5 x 1014 – 3 x 1016 |
What is the formula for electromagnetic energy?
Electromagnetic radiation can be described by its amplitude (brightness), wavelength, frequency, and period. By the equation E = h ν E=h\nu E=hν , we have seen how the frequency of a light wave is proportional to its energy.
What is the energy of electromagnetic waves?
The energy in electromagnetic waves is sometimes called radiant energy.
What is the frequency of hertz?
The number of periods or cycles per second is called frequency. The SI unit for frequency is the hertz (Hz). One hertz is the same as one cycle per second.
How do you find the hertz of a wave?
If you want to calculate the frequency from wavelength and wave velocity:
- Make sure they have the same length unit.
- Divide the wave velocity by the wavelength.
- Convert the result to Hertz. 1/s equals 1 Hertz.
What is the frequency of a radio wave with a wavelength of 3 m?
| Frequency | Wavelength |
|---|---|
| 1 MHz = 1,000,000 Hz = 106 Hz | 300 m |
| 10 MHz = 10,000,000 Hz = 107 Hz | 30 m |
| 100 MHz = 100,000,000 Hz = 108 Hz | 3 m |
| 1000 MHz = 1000,000,000 Hz = 109 Hz | 0.3 m |