"The Mosquito"

This is a sound technique to drive adolescents nuts. In general, this can only be heard by people below 25 years old.






But there is a small probability of people above that age group to hear this sound. The frequency is 17.4 KHz.

Hz is Hertz = unit of frequency

1 Hz = 1 cycle/Second (S)

1 KHz = 1,000 Hz.
17.4 KHz = 17,400 Hz.

It falls under Very Low Frequencies (VLF) of Radio waves in the Electromagnetic Spectrum.

The reason why adults don't hear this is that they have Presbycusis which is normal.

Presbycusis- is the natural age-factor hearing loss.

British stores use the Mosquito to repel the teenagers from loitering in front of the store.

Infants and young children, may be very sensitive to this type of frequency. So, the parents, must notice this in the reaction of the children.

God Bless!