Concise Physics Class 9 ICSE Solutions for Chapter 8 - Propagation of Sound Waves

ICSE Class 9 Physics Chapter 8 Selina Concise Solutions - Free PDF Download

The main objective of Selina Concise ICSE Solutions Class 9 is to develop a brief understanding of the topic and to clear the basic concepts of students. We have arranged the contents step-by-step in simple language that can be easily understandable even by average students.

Further, various efforts have been made to explain complicated topics by using simple diagrams and provide clear explanations for all aspects of the subject at the school level. In order to make the learning process interesting and appealing for the students, we have conducted many experiments.

For a quick revision, there is a Recapitulation section at the end of every chapter. Detailed exercise with numerical problems is given at the end chapter to help students test their knowledge and have a better grasp of the subject.

In every topic, our subject experts have made great effort to develop a spirit of enquiry, scientific temper, appreciation, and curiosity in students.

Selina Concise Physics Class 9 ICSE Solutions for Chapter 8 Propagation of Sound Waves part-1
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FAQ (Frequently Asked Questions)

Q1. Can Sound Travel in the Air? Explain in Brief.

Ans: Sound travels through any medium viz: solid, liquid and gas. However, it cannot travel through a vacuum.

If you see any object moving forward, it pushes and compresses the air, thereby making a space of high pressure. With this back and forth movement, there are a series of rarefaction and compression created in the air. This lets the sound wave propagating through the media.

Q2. What is the Speed of Sound in Different Media?

Ans: The speed of sound in different media depends on the conditions below.

  1. It depends on the properties of the medium. 

  2. It also depends on the temperature and pressure of the medium.

  3. It decreases when we move from solid to a gaseous state

  4. With the rise in temperature, the speed of sound also rises.

Q3. Does the Speed of Sound in the Air be Affected by Temperature?

Ans: The speed of sound in air varies. The speed rises by 0.6 m/s for every 1°C rise in temperature.

Q4. Describe the Production of Sound.

Ans: Sound is produced because of the vibration of objects. 

For instance:

  1. Clapping of palms

  2. Vibration produced by strings

  3. Beating a diaphragm of a drum

  4. By flute due to vibration of air-column

  5. By guitar because of vibration of it strings

In the examples mentioned above, their amplitude is too less that one cannot see, but can feel.

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