Frequency is how often something happens.
Gamma Rays
frequencey
A frequency diagram.
To measure sounds frequency you have to do a sound test.
The hertz (Hz) is commonly used. Its dimensions are 1/second.
The Doppler effect is a change of the frequencey of a wave, due to relative movement between source and observer.
Rechargable battery life willd epend on the device in which they are used and the frequencey in which they are charged.
Frequency = (speed)/(wavelength) = 10/20 = 1/2
Visible light has lower frequency / longer wavelength than x-rays.
It depends where you are in the world. In North America the most common used voltage is 120/240 and the frequency is 60 Hertz.
Increasing the wave speed will not affect the frequency of the wave. The frequency of a wave is determined by the source of the wave and will remain constant regardless of the wave speed.
The length of a radio wave at 900 kHz is 3331/3 meters, or about 1093.6 feet.