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![NCERT solutions for Science [English] Class 9 chapter 11 - Sound - Shaalaa.com](/images/science-english-class-9_6:8626690beaa343fd99329119ec507003.jpg "NCERT solutions for Science [English] Class 9 chapter 11 - Sound")
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Solutions for Chapter 11: Sound
Below listed, you can find solutions for Chapter 11 of CBSE NCERT for Science [English] Class 9.
NCERT solutions for Science [English] Class 9 11 Sound Intext Questions [Pages 129 - 136]
How does the sound produced by a vibrating object in a medium reach your ear?
Explain how sound is produced by your school bell.
Why are sound waves called mechanical waves?
Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?
Which wave property determines loudness?
Which wave property determines pitch?
Guess which sound has a higher pitch:
guitar
car horn
What are wavelength, frequency, time period and amplitude of a sound wave?
How are the wavelength and frequency of a sound wave related to its speed?
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
Distinguish between loudness and intensity of sound.
In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
Why are the ceilings of concert halls curved?
What is the audible range of the average human ear?
What is the range of frequencies associated with infrasound?
What is the range of frequencies associated with ultrasound?
NCERT solutions for Science [English] Class 9 11 Sound Exercises [Pages 138 - 139]
What is sound and how is it produced?
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
Why is sound wave called a longitudinal wave?
Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
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.
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.
The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
Does sound follow the same laws of reflection as light does? Explain.
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?
Give two practical applications of reflection of sound waves.
A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m s−2 and speed of sound = 340 m s−1.
A sound wave travels at a speed of 339 m s−1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
What is reverberation?
How can reverberation be reduced?
What is loudness of sound? What factors does it depend on?
How is ultrasound used for cleaning?
Explain how defects in a metal block can be detected using ultrasound.
Solutions for 11: Sound
NCERT solutions for Science [English] Class 9 chapter 11 - Sound
Shaalaa.com has the CBSE Mathematics Science [English] Class 9 CBSE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT solutions for Mathematics Science [English] Class 9 CBSE 11 (Sound) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Science [English] Class 9 chapter 11 Sound are Production of Sound, Reflection of Sound, Sound (Numerical), Characteristics of a Sound Wave, Range of Hearing in Humans, Ultrasonic Sound Or Ultrasound, Reverberation, SONAR, Human Ear, Echoes, Sound, Propagation of Sound, Sound Need a Medium to Travel, Speed of Sound (Velocity of Sound), Sound Waves Are Longitudinal Waves, Uses of Multiple Reflection of Sound, Production of Sound, Reflection of Sound, Sound (Numerical), Characteristics of a Sound Wave, Range of Hearing in Humans, Ultrasonic Sound Or Ultrasound, Reverberation, SONAR, Human Ear, Echoes, Sound, Propagation of Sound, Sound Need a Medium to Travel, Speed of Sound (Velocity of Sound), Sound Waves Are Longitudinal Waves, Uses of Multiple Reflection of Sound.
Using NCERT Science [English] Class 9 solutions 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 NCERT Solutions are essential questions that can be asked in the final exam. Maximum CBSE Science [English] Class 9 students prefer NCERT Textbook Solutions to score more in exams.
Get the free view of Chapter 11, Sound Science [English] Class 9 additional questions for Mathematics Science [English] Class 9 CBSE, and you can use Shaalaa.com to keep it handy for your exam preparation.
