Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
question 7 please thankssss!
 alt="8.5 Questions
1. Researchers at the University of Adelaide, Australia,
are proposing to control cyanobacteria with ultrasound.
Research this topic using Internet resources, and answer
the following questions:
(a) What are cyanobacteria, and why are these bacteria
important to control?
(b) How are cyanobacteria traditionally controlled?
(c) Why does the treatment propose using low-frequency
ultrasound instead of high-frequency ultrasound?
2. An aircraft is flying at Mach 2. What does this mean? IK/U
3. An aircraft is travelling at Mach 0.83 in air at 10 °C. What
is its speed in kilometres per hour? ™ C
4. Explain why the speed of sound varies in the different
materials in Table 1 on page 395. Kru
5. In your own words, define (a) sound intensity, (b) loudness,
and (c) decibel. U C
6. Why are different units required for sound intensity and
loudness? Ku
7. In your own words, describe the concept of sound intensity.
K/UC
8. Research the loudness level that is safe for listening to
music on, for example, a personal music player.
(a) Is there a difference in the level depending on the
length of exposure?
(b) Suppose the volume scale of a personal music player
ranges from 0 to 10. Suppose also that each level
corresponds to an increase in volume of 10 dB. So
volume 1 = 30 dB and volume 3 = 50 dB, and so on.
What is the loudest level you should set your personal
music player to if you listen to music for 2 h a day?
9. A busy city street can produce sound levels near 90 dB,
depending on the number of large vehicles (Figure 2).
Calculate the ratio of the sound intensity of a power saw to
that of a city street. Refer to Table 2 on page 395. Express
your answer in words. ™Ⓒ
Figure 2
10. A burglar coughs with an intensity of 2.35 x 10-7 W/m².
The burglar alarm is sensitive to an intensity of
1.0 x 10-1⁰ W/m² and will ring if the detected sound is
30 dB greater than its detection threshold. Will the
burglar's cough be detected? ™Ⓒ
11. The federal government supports the construction of noise
barriers (also called sound baffles) on the sides of highways
that run through residential areas to reduce residential
noise. Research highway traffic noise barriers.
(a) What are the barriers made of?
(b) How do they work?
(c) How effective are the barriers in reducing residential noise?
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