Ultrasound refers to a sound wave with a frequency greater than the upper limit of human hearing, which is generally over 20 kHz. In general, humans can hear sounds with a frequency between 20 Hz and 20 kHz.
Banana is a native of south Asia and it was brought to the Western Hemisphere during the 16th century. Banana plant is an oversized herb belonging to the lily family. Although there are several varieties of banana, the most important one entering the trade is Musa sapientum.
EXAMIANS