Sound Test - 1

We know that, the sound is not transmitted by the actual movement of the particle. It is transmitted by the disturbance in the medium. The maximum distance moved by a vibrating layer on the either side of the mean position is called _______.

Match the following:

Materials               Speed of sound

(1) Air                   (a)  5170 m/s

(2) Water              (b) 5130 m/s

(3) Glass               (c) 1498 m/s

(4) Iron                  (d) 340 m/s

Meradona was standing on the cliff, 825 m from the point, from where the gun was fired. After how long he will hear the echo? Speed of sound is taken as 330 m/s.

There are some sounds which cannot be heard by human ear. These sounds have frequency, either more than 20 kHz or less than 20 Hz The sound whose frequency is less than the 20 Hz is called _______.

The sound energy has wide application in medical science, as well as in many other fields. The sound of high frequency used in medical science is called ultrasound. The ultrasound used for the checking of the functioning of human heart is called ___________.

Thomas was a mariner, and working in defense force of his country. He was posted on the border of his country and has to look after the activity of the enemy in the sea. His work was made easier by the induction of SONAR in his ship. What should be the frequency of the transmitter of SONAR needed to do the job?