What Is Ultrasonic and Its Application?
The ultrasonic is defined as sound waves with a frequency exceeding the human audible hearing limit. Ultrasonic sounds are too high for people to…
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Sound Waves
What Is an Ear and How Does It Function?
Ear is one of a pair of structures found on either side of the head of vertebrates. Ears are concerned with both hearing and…
What Is the Whispering Gallery of St Paul’s Cathedral?
The whispering gallery is one of the most famous features of Sir Christopher Wren’s great master piece, St. Paul’s Cathedral in London.
How Does a Tuning-fork Work?
A tuning-fork vibrates to give a musical note of definite pitch or frequency and is marked on the fork by a letter or symbol referring to it
When Was the Telephone Invented?
The invention of the telephone was the culmination of work done by many individuals, and involved an array of lawsuits founded upon the pate