NCERT - 8 - Science :: Sound
Go To: NCERT-Science-Grade 8
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Objective: To teach the students about sound and how sound is produced
Subtopics to be covered:
- How sound travel through different mediums
- How do we hear and characteristic of sound
- Sound pollution, effects and prevention of sound pollution
Learning Outcome:
- Students know about sound and difference between music and noise
- They know about the sound frequencies
- They know how do we hear and are aware of sound pollution"
[Contributor - Kripa S]
http://epathshala.nic.in/wp-content/doc/book/flipbook/ClassVIIIFlipbook/0855-Vigyan/Chapter-13/index.html (NCERT Hindi Medium)
http://epathshala.nic.in/wp-content/doc/book/flipbook/ClassVIIIFlipbook/0854-Science/Chapter-13/index.html (NCERT English Medium)
https://drive.google.com/open?id=0BzNF2YyqQxJ-OG5ORWlrTUpQMVk (JEPC Board) (Hindi Medium)
[Contributor - Kripa S]
(Source - Bodhaguru) https://www.youtube.com/watch?v=p4FQYTfXuFU (Hindi - Sound requires a medium )
(Source -OLI - NSS, IITB ) https://www.youtube.com/watch?v=sHTXhz6xUmA (Hindi - Sound)
[Contributor - Anu Nived]
http://www.ekshiksha.org.in/sound_VIII/figure_13.JPG (propagation of sounds in solids)
http://www.ekshiksha.org.in/sound_VIII/figure_11.JPG (propagation of sound in liquids)
https://s-media-cache-ak0.pinimg.com/736x/d1/09/04/d109049b8cd95b32bc1a852c24714085.jpg (Structure of an ear)
[Contributor - Arshea Bimal, Kripa S]
1. https://www.youtube.com/watch?v=BoSh_ei7KoI (Straw flute)
2. Make a list of sounds you hear in your surroundings.
3. Take a rubber band. Put it around the longer side of a pencil box. Insert two pencils between the box and the stretched rubber. Now, pluck the rubber band somewhere in the middle. Do you hear any sound? Does the band vibrate?
3. Take a metal dish. Pour water in it. Strike it at its edge by a spoon. Do you hear a sound? Again strike the plate and then touch it. Can you feel the dish vibrating? Strike the dish again. Look at the surface of water. Do you see any waves there? Now hold the dish. What change do you observe on the surface of water? Can you explain the change? Is there a hint to connect sound with the vibrations of a body?
4. https://www.youtube.com/watch?v=p64BlQfZsTk (roaring bottle)
[Contributor - Sagar Prithvi]
https://drive.google.com/open?id=0BzNF2YyqQxJ-V1ZaQlpDYmxDLUE
[Contributor - Fathima Nazar]
| Term | Transliterated Term | Translated Term |
| AMPLITUDE | आम्प्लीट्यूड | आयाम |
| AUDIBLE | ऑडिबल | श्रव्य |
| EARDRUM | इयर ड्रम | कर्ण पटह |
| HERTZ (Hz) | हेर्त्ज़ | हर्ट्ज |
| LARYNX | लरिंग्स | कंठनली |
| LOUDNESS | लाउडनेस | प्रबलता |
| NOISE | नॉइस | शोर |
| OSCILLATION | ऑसिलेशन | दोलन |
| PITCH | पिच | तारत्व |
| SHRILLNESS | श्रिलनेस | तीक्ष्णता |
| TIME PERIOD | टाइम पीरियड | आवर्तकाल |
| VIBRATION | वाइब्रेशन | कंपन |
| WIND PIPE | विंड पाइप | श्वास नली |
[Contributor - Sagar Prithvi]
https://drive.google.com/open?id=0BzNF2YyqQxJ-RkdlOUJzNUZGWlE
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