SECOND, What is Ultrasound?

What about sound at higher pitch? Ever heard someone say that an opera singer’s piercing voice may shatter glass windows? Fact or Fiction? Read the fun fact below to find out!

Moving on from high-pitched sounds, have you ever encountered the word, ULTRASOUND?

Ultrasound is a subset of sound- a sound wave that has a much higher frequency (resulting in a higher pitch) that is inaudible to humans. 

Ultrasound is used in medicine and diagnosis such as ultrasound scan for pregnancy. The following summarises how ultrasound works:

Ultrasound Scan

1.The ultrasound machine transmits high-frequency sound pulses into the body using a probe, which travel into the body and hit a boundary between tissues. 2.Some of the sound waves get reflected back to the probe, while some travel on further until they get reflected. 3.The reflected waves are picked up by the probe and relayed to the machine. 4.The machine calculates the distance to the tissue or organ using the speed of sound in tissue (medium) and the time of the each echo's return (usually millionths of a second). The machine displays the distances and intensities of the echoes on the screen, forming a two dimensional image.

Here is a video provided for a concise summary on ULTRASOUND! :)