100
Fourth.
1 mile = 1609 meters 400 meters = 400/1609 miles ~ one fourth mile
3.25% = 13/400
400
The lowest resonant frequency of a closed pipe is the fundamental frequency, so the next resonant frequency that would not resonate in that pipe would be the second harmonic (2 times the fundamental frequency), which would be 400 Hz. Any odd harmonics (3rd, 5th, 7th, etc.) would also not resonate in that closed pipe.
400
Frequency of red is around 400 Terahertz.
The wave frequency for 400 nanometers is approximately 750 terahertz (THz). This can be calculated using the formula: frequency = speed of light / wavelength.
The Fourth Bear has 400 pages.
100
400-16000
400 HZ
If a note has a frequency of 400 Hz, it means that there are 400 sound waves produced in one second. The frequency of a sound wave is the number of complete waves that pass a point in one second.
Fourth.
The frequency of infrared radiation ranges from about 300 GHz to 400 THz.
An airplane generator typically operates at a frequency of 400 Hz. This high frequency is used to provide a more compact and lightweight design for the electrical system on aircraft.