To measure sounds frequency you have to do a sound test.
Frequency is how often something happens.
Gamma Rays
frequencey
A frequency diagram.
The sounds they measure and listen to when doing a transvaginal ultrasound and tell you you are not pregnant are ultrasounds.
The hertz (Hz) is commonly used. Its dimensions are 1/second.
watt is a unit of measure. Units of measure don't make sounds.
Frequency = (speed)/(wavelength) = 10/20 = 1/2
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.
oscilloscope
Take a sound pressure level meter (SPL meter). Try to measure the sound pressure p.