Question

SUMMATIVE ASSESSMENT
0.1
. Answer the following statements in one word.
(a) The repetition of the original sound because of reflection by some surface
Ans.
(b) Sound with frequency smaller than 20 Hz
Ans.
(c) Reflected sound heard continuously multiple times
Ans.
(d) The technology that uses ultrasonic sound waves to generate images of internal organs of the
human body
Ans.
Study of Sound
111​

Answer 1

Answer:

1) echo

2) infrasonic sound

3) reverberation

4) sonography

Answer 2

Answer:

● Repetition of sound caused by the reflection of the sound wave is called as an echo. ... Reverberation 

● The sounds having frequency less than 20 Hz are called ultrasonics.

● : An echo is heard when time interval between the reflected sound

● Ultrasound is safe and painless. It produces pictures of the inside of the body using sound waves.ultrasound scanning or sonography.