Case Study Questions for Class 8 Science Chapter 13 Sound
Here we are providing case study questions for CBSE Class 8 Science Chapter 13 Sound.
Case Study Questions
Question 1:
Sound plays an important role in our life. It is a form of energy which makes us hear . Vibrating objects produce sound. Vibration is the to and fro or back and forth movement of an object. Sound needs a medium to travel. Hence, it cannot travel in a vacuum.
Human beings have a voice box or larynx which is present in their throat on the upper side of the windpipe. The larynx has two vocal cords which have a narrow slit between them so that air can pass through it. As the lungs throw the air out of the windpipe, it passes through the slit and hence allows the production of sound as the vocal cords start vibrating. Since sound travels in the form of waves, it is important to study about characteristics of waves. The three main properties of waves are Amplitude, frequency, and time period.
The magnitude of disturbance in the medium on either side of the mean value is called as Amplitude(A). Larger the amplitude, louder the sound. The number of oscillations/vibrations per second is called frequency. which is expressed in Hertz (Hz). Time taken for one complete oscillation/vibration is the time period.
i) Which part of the human throat is responsible for the voice produced by a human?
ii) The form of energy which enable us to hear:
iii) The rapid to and fro or up and down movement of an object from its mean position:
iv) The maximum displacement of a vibrating object from its mean position:
Answers
i) Larynx
ii) Sound
iii) Vibration
iv) Amplitude
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