Question

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pond of water at the base of the tower. When is the splash
14. A sound wave travels at a speed of 339 m s-. If its
wavelength is 1.5 cm, what is the frequency of the wave?
Exercises
1. What is sound and how is it produced?
2. Describe with the help of a diagram, how compressions and
rarefactions are produced in air near a source of sound.
3. Cite an experiment to show that sound needs a material
medium for its propagation.
4. Why is sound wave called a longitudinal wave?
5. Which characteristic of the sound helps you to identify your
friend by his voice while sitting with others in a dark room?
6. Flash and thunder are produced simultaneously. But thunder
is heard a few seconds after the flash is seen, why?
7. A person has a hearing range from 20 Hz to 20 kHz. What are
the typical wavelengths of sound waves in air corresponding
to these two frequencies? Take the speed of sound in air as
344 m s-1.
8. Two children are at opposite ends of an aluminium rod. One
strikes the end of the rod with a stone. Find the ratio of times
taken by the sound wave in air and in aluminium to reach the
second child.
9. The frequency of a source of sound is 100 Hz. How many times
does it vibrate in a minute?
10. Does sound follow the same laws of reflection as light does?
Explain.
11. When a sound is reflected from a distant object, an echo is
produced. Let the distance between the reflecting surface and
the source of sound production remains the same. Do you
hear echo sound on a hotter day?
12. Give two practical applications of reflection of sound waves.
13. A stone is dropped from the top of a tower 500 m high into a
heard at the top? Given, g = 10 m s2 and speed of sound
340 m s-
Will it be audible?
SCIENCE​

Answer 1

Answer:

1.Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.