Vibrations of Sound

# Class 10 Physics Chapter 6 Vibration of sound Important Questions

Sound is a form of energy that we can hear. It arises from the vibrations or oscillations of particles in a medium, typically air, water, or solids. Without these vibrations, there would be no sound. This is why there's no sound in a vacuum (like outer space) since there are no particles to vibrate and transmit sound waves. you will find class 10 Vibration of sound  important questions and answers in vibration of sound.

## Introduction

When an object vibrates, it causes the particles around it to move. These moving particles bump into the particles next to them, passing on the vibration. This creates a chain reaction that moves outwards from the source in the form of a wave. These waves, called sound waves, are what we interpret as sound once they reach our ears. The vibration of sound is a fascinating interplay of physics and biology. Whether it's the rustling of leaves, the buzz of a phone, or the melody of a song, it all starts with vibration. If you want to practice more questions and clear your understanding, then oswal.io provides you with ICSE class 10 physics important questions.

## What are Vibration of sound ?

The vibration of sound refers to the rapid back-and-forth movement of particles in a medium (such as air, water, or solids) that creates a mechanical wave transmitting sound energy. When an object vibrates, it causes nearby air particles to oscillate, creating regions of compression and rarefaction. These alternating regions of high and low pressure propagate outward, forming a sound wave. The frequency of these vibrations determines the pitch of the sound—the higher the frequency, the higher the pitch. Amplitude, which corresponds to the magnitude of particle displacement, affects the loudness or volume of the sound. Our ears detect these vibrations and convert them into electrical signals, allowing us to perceive and interpret sound.

### Class 10 Vibration of sound Important Questions and Answers

#### (a) 0.15 Hz(b) 0.12 Hz(c) 0.09 Hz(d) 0.06 Hz

Ans. (c) 0.09 Hz

Explanation:
We know that, frequency $$f - \dfrac{1}{2\pi} \sqrt{\dfrac{g}{l}}$$, Where g is the gravitational acceleration and l is the pendulum's length. Acceleration due to gravity on the moon is 6 times less than acceleration due to gravity on earth. The earth's gravitational acceleration is 9.81 m/s2. The pendulum's length is specified as 500 cm, or 5 metres. Applying these conditions in the formula gives the natural frequency as 0.09 Hz.

#### (a) Damping(b) Lighting(c) Magnetism(d) Resonance

Ans. (d) Resonance
Explanation:
Tuning a particular radio station is based on the phenomenon of resonance.

#### Q3.  Explain why are stringed musical instruments provided with large sound boxes?

Explanation:
The large sound box contains large amount of trapped air. When the vibrations of the vibrating string are impressed upon the air, it starts vibrating with forced vibrations. As large volume of enclosed air vibrates, a loud sound is produced.

#### Q4. What is meant by an echo?

Explanation:
The sound heard after reflection from a distant object, after the original sound dies off, is called an echo.An echo is a sound that is reflected off a surface and heard again. It occurs when sound waves travel, hit an obstacle, and then reflect back to the source or listener. For an echo to be distinguished from the original sound, there needs to be a sufficient time gap between the two.

#### Q5. State three conditions for the formation of echoes.

Explanation:
Three conditions for the formation of echoesare as follows:
(i) The minimum distance between the source of sound and the reflecting surface should be 17 metres.
(ii) The size of reflector must be larger than the wavelength of sound.
(iii) The intensity of sound should be sufficient such that it can be heard after reflection.

#### ICSE Class 10 Physics Chapter wise Important Questions

Chapter No. Chapter Name
Chapter 1 Force Work Power and Energy
Chapter 2 Simple Machines
Chapter 3 Refraction of Light
Chapter 4 Refraction Through Lenses
Chapter 5 Spectrum
Chapter 6 Vibrations of Sound
Chapter 7 Sound
Chapter 8 Electricity
Chapter 9 Electrical Power and Household Circuits
Chapter 10 Magnetic Effect of Current
Chapter 11 Specific Heat Capacity and Latent Heat
Chapter 12 Radioactivity and Nuclear Energy

#### Conclusion

Sound is inherently tied to the phenomenon of vibration. At its most basic, sound originates from the vibrations of objects, which set surrounding particles of a medium (like air, water, or a solid substance) into oscillatory motion. These oscillations create pressure waves that propagate through the medium, and when they reach our ears, they are perceived as sound. If you seek additional practice and a deeper comprehension of the topics covered in the chapter, oswal.io offers an extensive array of  ICSE class 10 physics important questions chapter wise 2023-24  to facilitate a more profound understanding of the concepts.

#### Q1 : What is vibration in relation to sound?

Ans: Vibration refers to the rapid back-and-forth motion of an object. In relation to sound, these vibrations cause pressure waves in the surrounding medium (e.g., air), which we perceive as sound when they reach our ears.

#### Q2 : How are sound waves produced?

Ans:  Sound waves are produced when an object vibrates. This vibration causes adjacent particles in a medium to oscillate, creating compressions and rarefactions that propagate as sound waves.

#### Q3 : What determines the pitch and loudness of sound?

Ans: The frequency of the vibration determines the pitch of the sound: higher frequencies result in higher pitches and vice versa. The amplitude of the vibration determines the loudness: larger amplitudes produce louder sounds, while smaller amplitudes result in softer sounds.

#### Q4 : Can sound travel in a vacuum?

Ans:  No, sound cannot travel in a vacuum. Sound requires a medium (like air, water, or solids) for the vibrations to propagate. In a vacuum, there are no particles to carry the vibrational energy.

#### Q5 : Why can we hear a wide range of sounds, from a whisper to a roar?

Ans: Our ears are sensitive to a wide range of sound amplitudes, from the gentle vibrations of a whisper to the powerful vibrations of a roar. Additionally, our brains can process and interpret these vibrations, allowing us to recognize different sounds.

## Chapter Wise  Important Questions for ICSE Board Class 10 Physics

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