Question

taken by the sound wave in air and in alumin
12. Give two practical applications of reflex
r
Sound
terined "infrasonic" and
termed "ultrasonic".
icebergs, sunken ships etc.
Ultrasound has many medical and industrial applicat
The SONAR technique is used to determine the depth
sea and to locate under water hills, valleys, subma
to these two frequencies? Take the speed of $
8. Two children are at opposite ends of an alum
strikes the end of the rod with a stone. Find
9 The frequency of a source of sound is 100H
10. Does sound follow the same laws of reflec
11. When a sound is reflected from a distan
produced. Let the distance between the
the source of sound production remati
hear echo sound on a hotter day?
Exercises
1. What is sound and how is it produced?
12. Describe with the help of a diagram, how compress
rarefactions are produced in air near a source of so
(3. Cite an experiment to show that sound needs
medium for its propagation.
4. Why is sound wave called a longitudinal wave?
5. Which characteristic of the sound helps you to
friend by his voice while sitting with others in a
6. Flash and thunder are produced simultaneously
is heard a few seconds after the flash is seen,"
17. A person has a hearing range from 20 Hz to 201
the typical wavelengths of sound waves in air
344 ms.
second child.
does it vibrate in a minute?
Explain.
13. A stone is dropped fro
pond of​

Answer 1

Answer:

IDKkkkkkkkkkkkkkkkkkkkk