NCERT Solutions for Class 8 Science Chapter 13- Sound
NCERT Solutions for Class 8 Science Chapter 13-Sound cover all important topics covered in this chapter. The important topics covered in this chapter are sounds produced by a vibrating body, sounds produced by humans, sound needs a medium of propagation, sound in humans, amplitude, time period and frequency of a vibration, audible and inaudible noise, the difference between noise and music, noise pollution and methods to reduce noise pollution. Our NCERT Solutions Chapter 13 – Sound answer to all 11 questions of the exercise given at the end of NCERT Class 8 Science Chapter 13 in detail. They are written in a lucid language and are fully accurate.
These NCERT Solutions have been prepared by our renowned science teachers who are prepared as per the latest CBSE Syllabus. For scoring high marks in your exams, you must study NCERT Class 8 Science Book along with our exclusive and explanatory NCERT Solutions. They are the best study material when it comes to learning and revising complex topics effectively and quickly. They have been drafted in a manner to facilitate and promote smart learning.
Our Chapter 13-Sound has been designed to give you a quality learning experience with crisp and concise explanations, illustrative diagrams and exposure to various question types important from exam viewpoint. They help you expand your knowledge and build a strong conceptual foundation. With our smart NCERT Solutions for Class 8 Science Chapter 13-Sound, you can take your studies wherever you go and learn as per your convenience.
NCERT Class 8 Science Chapter 13
In this part of NCERT Solutions for Class 8th Science Chapter 13 – Sound, you will understand what sound is and how it is produced. You will also learn sound and waves are interlinked with each other. This chapter teaches you why sound plays an important role in our everyday life. Some of the important concepts covered in this chapter have been given below.
- Sound is produced by a vibrating body
In this topic of NCERT Class 8 Science Chapter 13 you will learn how the vibration of objects produces sound and how sound travels from one place to another place in the form of waves. Here, you will be explained with a proper example of what is a sound wave. In this chapter, you will also be reading about wave and particle motion of the wave, transverse waves, longitudinal waves and sound properties.
- Sound Produced by Humans
In this topic of NCERT Class 8 Science Chapter 13 you will be reading about how sounds are produced by humans and why the voice box is called a larynx. Here you will also learn about the location of the larynx. You are provided with information about the male and female vocal cords, sound ranges and also how it differs from children and adults.
- Sound Needs a Medium of Propagation
In this topic of Class 8 Science Sound, you will be taught why sound always needs a medium to travel from the source of its production to the other end, which is the receiver end. You will come across different mediums of propagations like solid, liquid and air. You shall also learn reasons why sound cannot travel through a vacuum.
- We Hear Sounds through Our Ears
In this topic of Class 8 Science Sound, you will be taught about each and every portion of the ear. Here, you will understand how the ear collects sounds from the surroundings and also about the vibrations that you hear travels in the form of signals to the brain. In this section, you will be explained all about an ear with an illustrative diagram to help you understand clearly. Some human ear parts covered in this section include outer ear called the pinna, external auditory canal, eardrum also known as the tympanic membrane, semicircular canals, vestibular nerve, cochlear nerve, cochlea, eustachian tube, incus, malleus and tympanic cavity.
- Amplitude, Time Period and Frequency of a Vibration
In this topic, you will learn in detail about the meaning of amplitude, frequency and time period of vibration. This section also elaborates about the loudness of pitch.
- Audible and Inaudible Sounds
In this topic, you will learn about the audible sounds which could be heard by human ears and its range. It also teaches you about inaudible sounds which cannot be heard by human ears and its frequency range. The audible range is 20 Hz to 20kHz termed as the sonic range. Below 20Hz is inaudible range termed as infrasonic range and the range above 20kHz is termed ultrasonic range.
- Noise and Music
In this topic, you will learn to differentiate between various sounds based on the quality of the sound. This section will teach you about pleasant and unpleasant sounds which could be distinguished with their pitch and loudness. Here you will learn that pleasant sounds are music and unpleasant ones are noise.
- Noise Pollution
In this topic, you will learn about the unwanted noise around us. You will also get to learn how these unwanted noises disturb human beings and animals. This topic of the NCERT Solutions for Class 8 Science Chapter 13-Sound, also teaches you how to reduce this noise pollution in society.
NCERT Solutions for Class 8 Science Chapter 13-Sound Exercise
In CBSE NCERT Class 8 Science book, there is one exercise which comprises 13 questions.
- Question 1 and question 2 are multiple-choice questions in which you are given 4 options each, and you have to choose one correct option from the given options.
- Question 3 is a true or false question. Question 4 is fill in the blanks question.
- Questions 5 and 6 is a simple numerical based on the concept of amplitude, time period and frequency of vibration.
- Question 7 is a short answer question. In this, you have to write about various vibrations produced by the given instruments.
- Question 8 is a differentiative question, in which you will have to write the difference between noise and music.
- Question 9, 10 and 11 are direct short answer questions. These questions are asked from the topic of noise pollution concept.
- Question 12 is a diagrammatic question. Here you are required to sketch diagrams and label them appropriately. It covers the topic sound in humans.
- Question 13 is a short answer question from the lightning and thunder concept.