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# Solutions 13. Sound - Additional Questions With Solutions | Class 8 Science - Toppers Study

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## Solutions 13. Sound - Additional Questions With Solutions | Class 8 Science - Toppers Study

CBSE board students who preparing for class 8 ncert solutions maths and Science solved exercise chapter 13. Sound available and this helps in upcoming exams 2023-2024.

### You can Find Science solution Class 8 Chapter 13. Sound

• All Chapter review quick revision notes for chapter 13. Sound Class 8
• NCERT Solutions And Textual questions Answers Class 8 Science
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Chapter 13 Science class 8

### Additional Questions With Solutions class 8 Science Chapter 13. Sound

• Solutions 13. Sound - Additional Questions With Solutions | Class 8 Science - Toppers Study
• Class 8 Ncert Solutions
• Solution Chapter 13. Sound Class 8
• Solutions Class 8
• Chapter 13. Sound Additional Questions With Solutions Class 8

## Solutions 13. Sound - Additional Questions With Solutions | Class 8 Science - Toppers Study

Ques: What is sound?

Ans: When an object vibrates, it produces sound.

Ques: What is eco sound?

Ans: When any sound reflects by striking on any medium, that sound heard us again and again. This is called eco sound.

Ques: What is minimum audible range for human ears?

Ans: The audible range is 20 Hz to 20,000 Hz.

Ques: What is minimum audible distance from sound source to barrier medium?

Ans: 17.2 m.

Ques: What is S.I unit of frequency?

Ans: Hz (Hertz).

Ques: What is S.I unit of wave length?

Ans: S.I unit of wave length is meter.

Ques: By what organ human produces sound?

Ans: Vocal cord. (Larynx)

Ques: How do we produce sound?

Ans: Two vocal cords, are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air When the lungs force air through the slit, the vocal cords vibrate, producing sound.

Ques: In which mediums sounds propagate?

Ans: Solid, liquid and gas.

Ques: In which medium sound does not propagate?

Ans: Vacuum.

Ques: What is eardrum?

Ans: The shape of the outer part of the ear is like a funnel. 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.

Ques: Write the function of eardrum.

Ans: The eardrum sends vibrations to the inner ear.

Ques: What is oscillatory motion?

Ans: The to and fro motion of an object is known as vibration. This motion is also called oscillatory motion.

Ques: What is frequency? Write is its S.I unit?

Ans: The number of oscillations or vibrations per second is called the frequency of oscillation. The frequency is expressed in hertz (Hz).

Ques: On which measure does loudness of sound depend?

Ans: On its amplitudes.

Ques: What are two important properties of sound?

Ans: Amplitude and frequency are two important properties of any sound.