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Chapters
2: Work and Energy
3: Current Electricity
4: Measurement of Matter
5: Acids, Bases and Salts
6: Classification of Plants
7: Energy Flow in an Ecosystem
8: Useful and Harmful Microbes
9: Environmental Management
10: Information Communication Technology (ICT)
11: Reflection of Light
▶ 12: Study of Sound
13: Carbon: An important element
14: Substances in Common Use
15: Life Processes in Living Organisms
16: Heredity and Variation
17: Introduction to Biotechnology
18: Observing Space: Telescopes
![Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board chapter 12 - Study of Sound - Shaalaa.com](/images/science-and-technology-english-9-standard-maharashtra-state-board_6:5c9e2db8f20741f3a9290526164f2c03.jpg "Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board chapter 12 - Study of Sound")
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Solutions for Chapter 12: Study of Sound
Below listed, you can find solutions for Chapter 12 of Maharashtra State Board Balbharati for Science and Technology [English] 9 Standard Maharashtra State Board.
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board 12 Study of Sound Exercise [Page 137]
Fill in the blank and explain.
Sound does not travel through ______.
Fill in the blank and explain.
The velocity of sound in steel is ______ than the velocity of sound in water.
Fill in the blank and explain.
The incidence of ______ in daily life shows that the velocity of sound is less than the velocity of light.
Fill in the blank and explain.
To discover a sunken ship or objects deep inside the sea, ______ technology is used.
Explain by giving a scientific reason.
The roof of a movie theatre and a conference hall is curved.
Explain by giving a scientific reason.
The intensity of reverberation is higher in a closed and empty house.
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
Answer the following question in your own words.
What is an echo?
Answer the following question in your own words.
What factors are important to get a distinct echo?
Answer the following question in your own words.
Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
Where and why are sound-absorbing materials used?
Solve the following examples.
The speed of sound in air at 0°C is 332 m/s. If it increases at the rate of 0.6 m/s per degree, what will be the temperature when the velocity has increased to 344 m/s?
Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?
(The velocity of sound in air is 340 m/s.)
Sunil is standing between two walls. The wall closest to him is at a distance of 660 m. If he shouts, he hears the first echo after 4 s and another after another 2 seconds.
- What is the velocity of sound in air?
- What is the distance between the two walls?
Hydrogen gas is filled in two identical bottles, A and B, at the same temperature. The mass of hydrogen in the two bottles is 12 gm and 48 gm respectively. In which bottle will sound travel faster? How many times be as fast as the other?
Helium gas is filled in two identical bottles A and B. The mass of the gas in the two bottles is 10 gm and 40 gm respectively. If the speed of sound is the same in both bottles, what conclusions will you draw?
Solutions for 12: Study of Sound
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board chapter 12 - Study of Sound
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Concepts covered in Science and Technology [English] 9 Standard Maharashtra State Board chapter 12 Study of Sound are Sound, Propagation of Sound, Characteristics of a Sound Wave, Speed of Sound (Velocity of Sound), Speed of Sound in Different Media, Properties of Sounds, Audibility and Range, Reflection of Sound, Echoes, Reverberation, SONAR, Sonography, Human Ear.
Using Balbharati Science and Technology [English] 9 Standard Maharashtra State Board solutions Study of Sound exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Balbharati Solutions are essential questions that can be asked in the final exam. Maximum Maharashtra State Board Science and Technology [English] 9 Standard Maharashtra State Board students prefer Balbharati Textbook Solutions to score more in exams.
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