A wave's frequency is the number of cycles that are completed in a certain amount of time. The symbol for frequency is the lowercase f and we measure it in cycles per second, which is the same as the unit hertz. A wave with a frequency of 20 Hz completes 20 wave cycles every second.Be careful that you don't confuse frequency with period. This is a common mistake. wave is a disturbance that travels through a medium in a periodic fashion, carrying energy without transporting matter. Waves are described and measured by five wave parameters: the period, the frequency, the amplitude, the wavelength, and the speed.
Quick Answer. It takes three to five hours for the effects of novocaine and other local dental anesthetics to wear off completely, according to Jonathan G. Campbell, D.D.S. The tooth remains numb for one to two hours, while the tongue and lips remain numb for up to five hours. Continue Reading.
Topically applied preparations such as gel based Novocaine, 30 minutes to 45 min. Subcutaneous oral injection to deaden nerve response 30 min to 3 hours. Anesthesia to renderâ¦ unconsciousness depends on how long the surgery will take , and the approx body weight of the patient.