Science 13. Sound Class-8 Chapter Review- Apurva

Class 8 Science questions with answers

Chapter 13. Sound

Class 8 Science questions with answers for all excercise of Science ncert books in english medium chater wise solutions quick revision keypoints and additional question with solutions also categorised into short answered question with answer also long answered questions with answers. Science 13. Sound Class-8 Chapter Review- Apurva NCERT Solutions for Class 8 Science in english medium chapter 13. Sound. Well illustrated example and easy solution for ncert book.

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NCERT Solutions for Class 8 Science english medium

NCERT Solutions for Class 8 Science chapter 13 in english medium chapter 13. Sound is strongly required by cbse students now a days for preparing the board exams. These all materials are fully explained in easy and in importatant points that help the students during reviewing the chapters before cbse board exams. There are so many HOT questions for NCERT Solutions for Class 8th Science english medium that score high than usual. At this page we maintain four important sections like chapter review, ncert books exercise solutions, questions under chapter solutions, Examination based additional important questions with solutions for NCERT Books Science.

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Science 13. Sound Class-8 Chapter Review- Apurva

Some topics and pages in this chapter

1. Chapter Review Class 8 Science

2. Text Book Exercise Class 8 Science

3. Additional Questions With Solutions Class 8 Science

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Page 1 of 5

Chapter 13. Sound

Chapter Review

Chapter Review:

When an object vibrates, it produces sound.
When any sound reflects by striking on any medium, that sound heard us again and again. This is called eco sound.
The audible range of human ears is 20 Hz to 20,000 Hz.
The S.I unit of frequency is Hz (Hertz).
The S.I unit of wave length is meter.
The to and fro or back and forth motion of an object is termed as vibration.
In humans, the sound is produced by the voice box or the larynx.
The vocal cords in men are about 20mm long. In women these are about 5mm shorter.
When air has been removed completely from a vessel, it is said that there is vacuum in the vessel.
When sound enters in it, it travels down a canal at the end of
which a thin membrane is stretched tightly. It is called the eardrum.
The to and fro motion of an object is known as vibration. This motion is also called oscillatory motion.
The number of oscillations per second is called the frequency of oscillation.
The loudness of sound depends on its amplitude. When the amplitude of vibration is large, the sound produced is loud. When the amplitude is small, the sound produced is feeble.
The loudness is expressed in a unit called decibel (dB).
Unpleasant sounds are called noise.
Some animals can hear sounds of frequencies higher than 20,000 Hz.
Dogs have this ability.
Sound travels through a medium (gas, liquid or solid). It cannot travel in vacuum.