12. Sound-The Types of Sound Science Class 9 In English-CBSE Notes
Last Updated : 14 March 2026
Explore science cbse notes for Class 9 Chapter 12. Sound Topic The Types of Sound in English medium for exams preparation.
12. Sound-The Types of Sound Science Class 9 In English-CBSE Notes
Last Updated : 14 March 2026
12. Sound-The Types of Sound Science Class 9 In English-CBSE Notes
12. Sound
The Types of Sound
The Types of Sound :
We can't hear all kinds of sound. On the basis of hearing there are three types of sound:
(1) Infrasound : The sound of frequency less than 20 Hz is called infrasound or infrasonic sound. Such type of sound can't be heared by human being. There are some animals that produce infrasound.
(i) Rhinoceroses : Rhinoceroses communicate using infrasound of frequency as low as 5 Hz.
(ii) Whales and Elephant : Whales and elephants produce sound in the
infrasound range.
(iii) Rats and snake : It is observed that some animals get disturbed before earthquakes. Earthquakes produce low-frequency infrasound before the main shock waves begin which possibly alert the animals.
(2) Audible sound : The sound of frequency between 20 Hz to 20000 Hz is called audible sound.
(3) Ultrasound : Frequencies higher than 20 kHz are called ultrasonic sound or ultrasound. Ultrasound is produced by dolphins, bats and porpoises. Rats also play games by producing ultrasound.
Hearing Aid: People with hearing loss may need a hearing aid. A hearing aid is an electronic, battery operated device. The hearing aid receives sound through a microphone. The microphone converts the sound waves to electrical signals. These electrical signals are amplified by an amplifier. The amplified electrical signals are given to a speaker of the hearing aid. The speaker converts the amplified electrical signal to sound and sends to the ear for clear hearing.
Applications of Ultrasound :
Ultrasounds are high frequency waves. Ultrasounds are able to travel along welldefined paths even in the presence of obstacles.
Ultrasounds are used extensively in industries and for medical purposes.
Applications of Ultrasound:
(i) Ultrasound is generally used to clean parts located in hard-to-reach places, for example, spiral tube, odd shaped parts, electronic components etc.
(ii) Ultrasounds can be used to detect cracks and flaws in metal blocks.
(iii) Ultrasound is used in the medical field to detect illnesses/diseases.
(iv) Ultrasound is used in a device named SONAR, which is used to measure the depth of ocean in the ships.
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NCERT Solutions for Class 9 science Chapter 12. Sound Topic The Types of Sound
NCERT Solutions for Class 9 science Chapter 12. Sound Topic The Types of Sound are prepared to help students understand important concepts of the chapter in a simple and clear manner. These solutions are based on the latest CBSE syllabus and follow the official NCERT textbooks. Students who are searching for accurate answers and step-by-step explanations can use these solutions to improve their learning and prepare better for school exams as well as board examinations.
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About Chapter 12. Sound of Class 9 science
Chapter 12. Sound is an important part of the Class 9 science syllabus. This chapter explains several key concepts which are essential for understanding the subject in detail. Students often face difficulties while solving textbook questions related to this chapter. That is why NCERT Solutions for Chapter 12. Sound are provided to explain every concept in a simple and structured way.
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Understanding Topic: The Types of Sound
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Conclusion
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12. Sound-The Types of Sound Science Class 9 In English-CBSE Notes
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